Do I Need Vision Insurance?

With the rising costs of health insurance, many people are looking for ways to reduce their costs. Since not all insurance packages include vision insurance, many people wonder, do I need vision insurance?
vision insurance

Standard Vision Insurance

Vision insurance is a type of health insurance that entitles you to specific eye care benefits such as routine eye exams and other procedures, as well as a specified dollar mount or discount for the purchase of eyeglasses and contact lenses. It only supplements regular health insurance and is designed to help reduce your costs for routine preventative eye care and eyewear.

You can get vision insurance as part of a group, such as your employer, an association, etc., through a government program such as Medicare or Medicaid, or as an individual. It is often a benefit linked to your regular HMO (health maintenance organization) or PPO (preferred provider organization) health insurance.

There are two primary vision insurance plans available:

  • Vision Benefits Package – provides free eye care services and eyewear within a fixed dollar amount for which you pay an annual premium or membership fee and a small co-pay. It may also include a deductible.
  • Discount Vision Plan – provides eye care and eyewear at a discounted rate after you pay an annual premium or membership fee.

Both insurance plans generally include:

  • Annual eye exams
  • Eyeglass frames (usually once every 24 months)
  • Eyeglass lenses (usually once every 24 months)
  • Contact lenses (usually once every 24 months)
  • Discounted rates for LASIK and PRK

Here is where you can check for a list of some vision insurance providers.

Medicare and Medicaid

Different kinds of vision care are included in the US government programs, Medicare and Medicaid. These programs are for qualifying American age 65 and older, individuals with specific disabilities and people with low income.

The Types of Medicare For Vision:

    • Medicare Part A (Hospital Insurance) –Medical eye problems that require a hospital emergency room attention, but routine eye exams are NOT covered.
    • Medicare Part B (Medical Insurance) – Visits to an eye doctor that are related to an eye disease, but routine eye exams are NOT covered.
    • Medicare Part D (Prescription Drug Coverage) – Will help pay for prescription medications for eye diseases.

If you have Medicare Parts A & B you are generally eligible for the following vision coverage, however, there is a deductible before Medicare will start to pay, at which point you will still be paying a percentage of the remaining costs.

  • Cataract surgery – covers many of the cost including a standard intraocular lens (IOL). If you chose a premium IOL to correct your eyesight and reduce your need for glasses, you must pay for this added cost out-of-pocket.
  • Eyewear after cataract surgery – one pair of standard eyeglasses OR contact lenses.
  • Glaucoma screening – an annual screening for people at high risk for glaucoma, including people with diabetes or a family history, and African-Americans whom are 50 or older.
  • Ocular prostheses – costs related to the replacement and maintenance of an artificial eye.

There is also Medicare Supplement Insurance (Medigap) which is sold by private insurance companies to supplement only Medicare Parts A & B. It is intended to cover your share of the costs of Medicare-covered services including coinsurance, co-payments and deductibles. For more details about Medicare plans and coverage check their website or call 800-633-4227.

Medicaid is the US health program that gives medical benefits to low-income people who may have no or inadequate medical insurance. A person eligible for Medicaid may be asked to make a co-payment at the time medical service is provided. Vision benefits for children under the age of 21 include eye exams, eyeglass frames and lenses. Each state determines how often these services are provided and some states offer similar vision services to adults. To learn more about Medicaid eligibility requirements and vision benefits call your state’s Medicaid agency or visit their website.
vision dial - vision insurance

Defined Contribution Health Plans

A way to lower your vison care costs is to take part in a defined contribution health plan (DCHP). You are given a menu of health care benefits to choose from where a portion of the fees you receive for health coverage come from money that is deducted from our paycheck before federal, state and social security taxes are calculated. Four types of DCHP are:

Cafeteria Plans – your employer takes a portion of your salary and deposits it into a non-taxable account for health care spending. The amount taken depends on the number and costs of the benefits you select.

Flexible Spending Accounts (FSA) – your employer takes a predetermined portion of your pre-tax salary and deposits it into health care account for you to pay medical expenses. But generally preventative care such as routine eye exams and are not reimbursable. Nor are eyeglasses and contact lenses reimbursable. You would need to verify with your employer. If you do not use all the money at the end of a 12 month period, the money goes back to your employer.

Health Reimbursement Arrangement (HRA) – this is similar to an FSA except you can use it for preventative care like eye exams and you do not lose the money if it isn’t spent within a certain time period as it can be carried from year to year.

Health Savings Account (HSA) – it can be employer-sponsored of you can set up one independently; however you must purchase a high-deductible health insurance plan to open an HSA and you cannot exceed the annual deductible of your health insurance plan. You cannot be enrolled in Medicare of be a depended on someone else’s tax return. You can use it for preventive care such as eye exams. You can learn more about HSAs by visiting the US Treasury’s website.

There are a variety of options when it comes to vision insurance. You just need to determine your needs and ask providers the correct questions.

4/14/15


Susan DeRemerSusan DeRemer, CFRE
Vice President of Development
Discovery Eye Foundation

6 Ways Women Can Stop Vision Loss

Women account for 53% of the world’s population. However, 2/3 of the blind and visually impaired people in the world are women. While 80% of these women are in developing countries, women in developed countries like the US are still more likely to face vision loss than men.
women can stop vision loss

Why are women more prone to eye disease than men?

Women are the caregivers in families, taking care of the health of family members over themselves. In addition, with many having jobs outside the home, they don’t feel they have the time to go to the doctor until something major happens, especially related to vision.

Women live longer than men are at greater risk for age-related eye diseases such as age-related macular degeneration (AMD), diabetic retinopathy, glaucoma and cataracts.

Women are more likely to develop several autoimmune diseases that can affect their eyes including, multiple sclerosis, lupus, rheumatoid arthritis and Sj?gren’s syndrome.

75% of new breast cancer diagnosed each year is estrogen-sensitive. A common part of estrogen-sensitive breast cancer treatment includes the prescription of tamoxifen. More studies are being done, but cataracts due to tamoxifen have been identified in about 10% of the patients taking the drug.

What can women do to lessen their chances for eye disease?

Know your family history as genetics play and important role in your eye health, so know what eye diseases run in your family. Let your eye doctor know so he can look for early warning signs that can help prevent of lessen the conditions in you.

Get routine comprehensive, dilated eye exams starting at the age of 40, to create a baseline for your doctor to work from. After that you can go every 2-4 years until the age of 60. At 60+ have a compressive, dilated exam every two years if you are symptom-free and low risk.

Eat healthy and exercise. It is important to maintain a healthy weight to reduce the risk of some eye diseases. Eating fresh fruits and vegetables is also important as they can contain carotenoids an some antioxidants that appear to help with vision retention. It should also be noted that in many studies, supplements did not show the same beneficial effects as whole foods.

Stop smoking! You not only increase your risk for cancer and heart disease, but smoking is the only thing besides advancing age that has been proven to be directly related to AMD.

Avoid ultraviolet light by wearing sunglasses (with wide-brimmed hats) and indoor glasses with UV protection. While everyone knows the sun is a source of UV light, so are electronic screens such as your TV, computer, tablet or smartphone. Prescription glasses and readers can have a clear UV coating put on them that will not distort your color vision. If you don’t need vision correction, there is eyewear with no correction that is coated to protect your eyes to avoid dry eye and retinal damage.

Use cosmetics and contacts safely. Always wash your hands first. Throw away old makeup and lens solutions. Do not share cosmetics or apply while driving. Make sure to clean your lenses thoroughly before putting them in your eyes.

Because women are relied upon to take care of the family, vision loss that can impact that responsibility can be devastating to the entire family. And later in life, when they may have outlived a spouse, the isolation and depression can destroy their quality of life as they try to cope on their own.

Reach out to women you know and remind them to take an active part in their own healthcare. Especially with regards to their vision, when women are at a higher risk of vision loss than men.

4/7/15


Susan DeRemerSusan DeRemer, CFRE
Vice President of Development
Discovery Eye Foundation

Vision and Special Needs Children

In the United States, special needs is a term used in clinical diagnostic and functional development to describe individuals who require assistance for disabilities that may be medical, mental, or psychological. Different types of special needs vary in severity. People with autism, Down syndrome, dyslexia, blindness, ADHD, or cerebral palsy, for example, may be considered to have special needs. Statistics tell us that among children ages 3 to 17, nearly 15 percent have one or more developmental disabilities. For many of these children, the kinds of disabilities they experience may require special approaches to providing care, education and/or other accommodations.
eye exam - vision and special needs children
The way a special needs child behaves or reacts can sometimes be unexpected because he/she processes sensory information differently than other children. Having the right cues in our environment can mean the difference between participation and non-participation in medical care for many of these children. Our work environment should always be arranged in a way to achieve physical and emotional comfort for the child. Patience, attentive listening, caring, and building a trusting relationship with a family and child who may be undervalued in other settings are all critical to providing good medical care.

Vision and Special Needs Children

Children with special needs are referred to pediatric ophthalmologists on a regular basis. Many of these children do not respond appropriately to standard vision screening procedures. Unidentified vision problems in this special population can further impact growth and development. The role of pediatric ophthalmologists is to ensure that the child does not have any eye conditions that could potentially interfere with his/her learning opportunities, personal development and/or overall wellbeing.

Down syndrome:
Down syndrome continues to be the most common chromosomal disorder. Each year, about 6,000 babies are born with Down syndrome, which is about 1 in every 700 babies born. It is estimated that more than 80% of these patients have some clinically significant ocular pathology. Such conditions include refractive error requiring glasses (70%), strabismus (45%), and nystagmus (35%). Other common eye problems include blepharitis, blocked tear duct, eyelid ptosis, cataracts, and keratoconus (irregularly shaped cornea). The improved quality of medical care and educational resources have allowed for a more productive life and a longer life expectancy for people with Down syndrome. Their quality of life can be further enhanced by the proper assessment and correction of eye problems.

Autism:
In 2014, the Centers for Disease Control and Prevention (CDC) released new data on the prevalence of autism in the United States. This surveillance study identified 1 in 68 children (1 in 42 boys and 1 in 189 girls) as having autism spectrum disorder (ASD). Autistic behaviors may include visual components such as lack of eye contact, starring at light or spinning objects, fleeting peripheral glances, side viewing and difficulty attending visually. An eye examination is essential in order to detect an eye condition that could potentially explain these visual behaviors. According to a study published in the June 2013 issue of Strabismus, more than 40 percent of children with autism have strabismus, or crossed eyes. This work is limited in that the researchers did not use a representative sample of children with autism. Still, the prevalence of eye problems in autism appears to be several times higher than that of the general population.
boy eye exam - vision and special needs children
Learning Disabilities:
Dyslexia is the most common neurobehavioral disorder affecting children. Visual abnormalities have not been found to affect the brain’s ability to process visual stimuli and children with learning disabilities have no increased incidence of ophthalmologic disease. However, ophthalmologic consultation should be provided to children who fail vision screening tests. This allows for diagnosis and therapy of treatable ocular conditions such as refractive errors and eye muscle imbalances.

Children with ADHD, cerebral palsy, or any other neurodevelopmental disorders should also have periodic vision screenings. Children who do not pass the vision screening should be referred to an ophthalmologist with experience in the care of children.

Physicians are not the only adults involved in the care of special needs children. At increasing rates, children with special needs are being provided with the same life experiences as their non-disabled peers. Taking part in a sport or joining a group like the Scouts, are popular activities for children. Children with disabilities are encouraged to join in such activities to help improve their health and give them opportunities to make friends. As a result, more and more adults in the community are finding themselves working with these children on a regular basis.

When considering ways to work with special needs children, we have to keep in mind that every child is different. A positive attitude and patience are probably the two most important qualities for anyone who works with these children. Parents of special needs children focus on helping their child to be “the best he/she can be”. The devotion and care these parents provide for their child have been an inspiration, and I always look forward to my visits with them.

4/2/15


Dr. Chantal BoisvertChantal Boisvert, OD, MD
Assistant Clinical Professor
Gavin Herbert Eye Institute, UC Irvine
Pediatric Ophthalmology & Strabismus
Neuro-Ophthalmology

7 Spring Fruits and Vegetables

Spring is truly here. With Passover and Easter later this week, it is time to rediscover some of the amazing produce that is at its peak during the months of April, May and June. These 7 spring fruits and vegetables are not only delicious; they are good for you . . . and your vision. Here are some recipes for you to try and enjoy the bounty of spring. Some even include more than one of the seven fruits and vegetables listed below.
apricots - 7 Spring Fruits & Vegetables
Apricots – Apricots should be firm, but not hard, with a nice fruit scent when sniffed. They are best purchased locally so they aren’t picked too early and have a tree-ripened sweetness.

Apricot & Orange Breakfast Smoothie from Discovery Eye Foundation’s Eye Cook

Spicy Apricot Wings from Food & Wine

Fresh Apricot Chutney from Cooking Light

Chicken Tagine with Apricots & Almonds from Gourmet
asparagus - 7 Spring Fruits & Vegetables
Asparagus – Look for firm stalks, from the tips down to the base of stalks. Once asparagus are harvested they deteriorate quickly, so place them in cool storage to retain freshness and their nutrition value.

Asparagus and Strawberry Salad from Discovery Eye Foundation’s Eye Cook

Asparagus with Watercress and Brown Butter Potatoes from Food & Wine

Grilled Asparagus with a Caper Vinaigrette from Cooking Light

Asparagus, Tomato & Red Pepper French Bread Pizza from the Mayo Clinic
cherries - 7 Spring Fruits & Vegetables
Sweet Cherries – The best cherries are an inch or more in diameter, plump, firm, and rich in color.

Cherry Pie from Cooking Light

Cherry Tortoni from Gourmet

Cherry Tart from Bon Appétit

Easy Almond & Dried Cherry Cookies from Discovery Eye Foundation’s Eye Cook
fava beans - 7 Spring Fruits & Vegetables
Fava Beans – Young fava beans can be shelled and eaten either raw or cooked, but more mature favas need to be shelled and skinned, since their skins are too tough to eat.

Quinoa Salad with Grilled Scallions, Favas & Dates from Food & Wine

Sliced Filet Mignon with Fava Beans, Radishes & Mustard Dressing from Bon Appétit

Arugula & Fava Bean Crostini from Gourmet
green peas - 7 Spring Fruits & Vegetables
Green Peas – Fresh green peas include sugar snap peas, snow peas, and green peas. Look for bright green pods that are firm.

Fava, Sweet Pea & Sugar Snap Salad from Cooking Light

Salmon with Sweet Chili Glaze, Sugar Snap Peas & Pea Tendrils from Bon Appétit

Strawberry, Almond & Pea Salad from Bon Appétit
strawberries - 7 Spring Fruits & Vegetables
Strawberries – For the best flavor, you are best looking for strawberries grown close to home since they more are likely to be fresh and not be damaged in transit. They should be plump, firm, well-shaped, and uniformly colored.

Carrot & St rawberry Tea Bread from Discovery Eye Foundation’s Eye Cook

Strawberries Romanoff from Cooking Light

Strawberry and Cream Cheese Crepes from the Mayo Clinic

Pink Grapefruit, Strawberry & Champagne Granita from Bon Appétit
watercress - 7 Spring Fruits & Vegetables
Watercress – Look for uniformly dark green leaves and sniff for a fresh, spicy scent. Watercress has a short shelf life and should be kept in a plastic bag in the refrigerator for no more than three days.

Watercress, Orange & Avocado Salad from Gourmet

Watercress Salad with Verjus Vinaigrette from Food & Wine

Watercress Salad with Pan-Seared Mahimahi from Cooking Light

These are some great ways to enjoy  what spring has to offer.  Do you have any spring recipes you want to share?

3/31/15


Susan DeRemerSusan DeRemer, CFRE
Vice President of Development
Discovery Eye Foundation

Protective Eyewear for Home, Garden & Sports

Spring is here and it is always a good time to review important ways to protect your eyes now that you will be spending more time outdoors, enjoying sports, gardening or just basking in the warm spring sunshine.

Protective Eyewear for Home, Garden & Sports

protective eyewear - sunglasses
Sunglasses and wide brimmed hats are the first things to consider as you go outdoors. The damage from UVA/UVB rays from sunlight is ever present, even on cloudy days. It is also cumulative and can lead to cataracts and age-related macular degeneration. Don’t forget to use sunscreen generously, helping to prevent a painful sunburn and skin cancer. If you perspire a great deal, think of a waterproof sunscreen that will not run into your eyes causing blurry vision and irritation.
protective eyewear - goggles
In your backyard or garden it is wise to use safety glasses or goggles when operating a chain saw, axe or hedge clipper. They will help to prevent small flying objects, dirt and debris from getting into your eyes. Tree sap and plant secretions can also be hazardous to your eyes. Wearing gloves should make you think twice about rubbing your eyes, or at least you can remove them if you can’t resist.

Home maintenance and spring cleaning offer some of the same threats as gardening. Beware of using any regular or power tools, paints and chemicals without protective eyewear because of flying debris, drips, splashes and sprays. Besides the general eye irritations and painful corneal scratches, you could permanently impact your vision. Also take care if your children are helping or playing nearby, they could also be at risk.
protective eyewear - sports
Spring is a great time to get outdoors and enjoy your favorite sports, but if you engage in any activities that involve throwing and catching balls, “flying” arms and elbows (such as karate), swinging bats, sticks or clubs, or anything that involves shooting (such as paintball or airsoft), you need protective goggles that wrap around and protect you from all angles. Not every threat will be coming from directly in front of you.

For these sports and recreational activities prescription eyeglasses, sunglasses and even occupational safety glasses are not enough to protect your eyes. You will need a highly impact-resistant polycarbonate to avoid a lens that can shatter and cause additional danger to your eyes. Consult your eye care professional to choose the right kind of eye protection for your warm weather activities.

3/24/15


Susan DeRemerSusan DeRemer, CFRE
Vice President of Development
Discovery Eye Foundation

Do You Have a Pterygium?

A pterygium (pronounced tur-IJ-ee-um) is a wing-shaped, fleshy growth of tissue that grows from the conjunctiva (the clear thin covering of the sclera or white part of the eye) onto the cornea (the clear front of the eye). The word pterygium comes from the Greek, pterygos, which means little wing. Pterygia are quite common and can be seen in surfers (hence the common reference as surfer’s eye), sunbathers, landscape architects and other outdoor people who do not adequately protect their eyes from the damaging ultraviolet radiation from the sun. Furthermore, people living closer to the equator have been shown to have a higher incidence of pterygia. Prolonged exposure to eye irritants such as wind and dust are also risk factors for the development of pterygia.
pterygium before & after
Pterygia usually grow slowly or follow an indolent course and can be asymptomatic or can flare up from irritation. Early on, pterygia may not be even noticed and may not be serious. Or, there can be signs of dry eyes, such as mild burning, tearing and itching due to irregular tear wetting of the surface of the eye. As the pterygium grows in size, the lesion will become more noticeable and may become cosmetically unpleasant, irritating to the patient and may give the sensation of a foreign body in the eye. Pterygia may cause visual symptoms if they induce astigmatism as they approach the center of the cornea or visual axis. Once the pterygium grows towards the visual axis, where vision could be compromised, various surgical procedures can be employed to remove it.

Having an ophthalmologist (an eye MD) examine your eyes is the first step to making the correct diagnosis and receiving the appropriate treatment, if it is necessary. Your ophthalmologist will examine the front of your eyes with a slit lamp, a specialized microscope for eye examination. Early in the disease process, most ophthalmologists will take a conservative approach and treat with lubricating eye drops and recommend protective eye wear (to prevent further UV exposure) and use of a wide-brimmed hat. If the pterygium enlarges and grows onto the cornea towards the visual axis, the ophthalmologist will consider surgical intervention to halt any more damage and scarring to the eye. Sometimes, a more aggressive pterygium may induce astigmatism on the cornea (causing the cornea to become more oval or football-like in shape as compared to more round in shape like a basketball). Astigmatism may cause blurred vision and, if left untreated, may not be reversed even with surgical intervention. Long-lasting pterygia may cause irreversible scarring of the underlying cornea, which may leave the cornea with a thin white film, or scar, even after the removal of the pterygium. If this scar is out of the visual axis, then vision may not be affected.

There are several different surgical techniques that are commonly used to remove aggressive pterygia. Microsurgical techniques can be done safely and comfortably on an outpatient basis in an eye surgery center using local anesthesia with mild sedation. The most common surgical technique involves surgical removal of the pterygium, placement of a preserved amniotic membrane graft (from the placenta) or a small graft of the patient’s own conjunctiva taken from the superior (upper) part of the conjunctiva to cover the area where the pterygium was removed, and using fibrin glue and/or small sutures to hold the graft in position. This procedure usually takes 30 minutes to one hour to perform, depending its complexity, with little discomfort for the patient. Post-operatively, the patient usually wears a patch for one day and can return to work after a few days (avoiding eye rubbing, swimming and hot tubs). Topical antibiotic and steroid drops and/or ointments are used for several weeks or months on a tapering dosage schedule per your ophthalmologist. Steroid medications reduce inflammation and chance of recurrence and should be used as directed. Careful follow-up for a year after surgery is recommended.

The main risk of pterygium surgery is recurrence of the pterygium after removal with a regrowth of abnormal tissue onto the cornea. When an amniotic membrane graft or conjunctival auto-graft is not used, the recurrence rate is quite high and has been reported from 25% to over 50%. However, when these grafts are used, the recurrence rate can be as low as 5 to 10%. For recurrent pterygium removal, however, the recurrence rate can be much higher and other adjunctive therapy may be utilized. Intraoperative mitomycin C (MMC) is often used in addition for recurrent pterygium excision to inhibit the regrowth of the pterygium. Some ophthalmologists use MMC eye drops after excision. Discuss these options with your ophthalmologist before your surgery. Be sure to see your ophthalmologist if you have a pterygium so that it can be properly assessed and appropriate treatment can be performed.

3/19/15

Ronald Gaster, MD, FACSRonald N. Gaster, MD, FACS
Gaster Eye Center
Beverly Hills and Huntington Beach, CA

Medical Research Funding Needs Individual Donors

The Need for Medical Research Funding

About 1.75 million U.S. residents currently have advanced age-related macular degeneration with associated vision loss, with that number expected to grow to almost 3 million by the year 2020.

About 8.4 million individuals worldwide are blind from primary open-angle glaucoma, with that number expected to grow to almost 11 million by the year 2020.

About 22 million Americans have cataracts affecting their vision, with that number expected to grow to more than 30 million by the year 2020.

The economic impact of this increase of people with vision loss will be tremendous.  But right now scientist are working on ways to treat and eventually cure many eye diseases.  The only problem is the funding necessary to support this sight-saving research. Here is a look at the decline of medical research funding in the US and what you can do to help.
medical research funding

3/17/15


 

Susan DeRemerSusan DeRemer, CFRE
Vice President of Development
Discovery Eye Foundation

The Optic Nerve And Its Visual Link To The Brain

The optic nerve, a cable–like grouping of nerve fibers, connects and transmits visual information from the eye to the brain. The optic nerve is mainly composed of retinal ganglion cell (RGC) axons. In the human eye, the optic nerve receives light signals from about 125 million photoreceptor cells (known as rods and cones) via two intermediate neuron types, bipolar and amacrine cells. In the brain, the optic nerve transmits vision signals to the lateral geniculate nucleus (LGN), where visual information is relayed to the visual cortex of the brain that converts the image impulses into objects that we see.
Optic Nerve
In the retinal tissues of the eye, more than 23 types of RGCs vary significantly in terms of their morphology, connections, and responses to visual stimulation. Those visual transmitting RGCs are the neuronal cells. They all share the defining properties of:

  1. possessing a cell body (soma) at the inner surface of the retina
  2. having a long axon that extends into the brain via the optic chiasm and the optic tract
  3. synapsing with the LGN. The RGCs form multiple functional pathways within the optic nerve to mediate the visual signal

Human beings can see three primary colors: red, green, and blue. This is due to our having three different kinds of color sensitive cone cells: red cones, green cones, and blue cones.

The RGCs connecting to the red and green cones are midget RGCs. They are mainly located at the center of the retina (known as fovea). A single midget RGC communicates with as few as five photoreceptors. They transmit red-green color signals to the parvocellular layer in the LGN (see Figure). The midget-parvocellular pathway responds to color changes, but has little or no response to contrast change. This pathway has center-surround receptive fields, and slow conduction velocities. Because of this pathway, we can see objects precisely in detail and in full color.
retina and optic nerve
The bistratified RGCs are likely involved in blue color vision. Bistratified cells receive visual information input originally from an intermediate numbers of cones and rods. The bistratified RGCs connect to the koniocellular layers in the LGN (see Figure). The koniocellular neurons form robust layers throughout the visual hemifield and have moderate spatial resolution, moderate conduction velocities, and can respond to moderate-contrast stimuli. They have very large receptive fields that only possess on-center regions (no off-surround regions).

Objects can be seen in the dark with motion and coarse outlines accentuated due to the parasol RGCs. At the periphery of the retina, a single parasol RGC connects to many thousands of photoreceptors (many rods and few cones). The parasol RGCs project their axons to the magnocellular layers of the LGN (see Figure) and are primarily concerned with visual perception. They have fast conduction velocities, can respond to low-contrast stimuli, but are not very sensitive to changes in color.

Finally, humans can see objects in three-dimension courtesy of the crossing over of optic nerve fibers at the optic chiasm. This anatomic structure allows for the human visual cortex to receive the same hemispheric visual field from both eyes (see Figure), thus making it possible for the visual cortex to generate binocular and stereoscopic vision.

Recently, a new type of RGC, called photosensitive RGCs, was discovered. The photosensitive RGCs contribute minimally to our vision, but play a key role in vision regulation. Photosensitive RGCs axons do not have connections to the LGN, but form the retino-hypothalamic tract, and synapse to three other locations in the brain for specific vision regulation functions:

  1. Pretectal nucleus: involved in reflexive eye movements, thereby helping to target what we want to see
  2. Midbrain nuclei: involved in controlling the size of the pupil, thus helping to adjust the brightness of objects; and coordinating movement of the eye for focusing
  3. Suprachiasmatic nucleus: involved in regulating the sleep-wake cycle

A fully functional optic nerve is essential for vision. Obviously, any damage of the optic nerve will sever the precise transmission of visual information between the retina and brain, directly leading to vision distortion and/or vision loss. Damage to the optic nerve can result from:

  1. Direct/indirect physical damage (e.g. ocular trauma)
  2. Acute/sub-acute physiological lesion (e.g. infection or inflammation, or malignancy (cancer))
  3. Chronic neuronal degeneration (e.g. glaucoma, a most common cause of optic nerve damage)

Moreover, the optic nerve is also a very important vivo model for studying central nervous protection and regeneration. At the cell biology level, the RGC axons are covered with myelin produced by oligodendrocytes (rather than Schwann cells of the peripheral nervous system) after exiting the eye on their way to the LGN and thus part of the central nervous system. Scientists have recently acquired more and more evidence that certain types of damage to the optic nerve may be reversible in the future. Therefore, the optic nerve provides a potential window to explore more complicated neuronal degenerative diseases, such as Alzheimer’s disease and Huntington disease.

3/12/15

Jun Lin, MD, PhD
Assistant Professor,
Department of Ophthalmology
New York Eye and Ear Infirmary of Mount Sinai
Icahn School of Medicine at Mount Sinai

—–

James Tsai, MD, MBA
Chair, National Eye Health Education Program Glaucoma
Subcommittee President, New York Eye and Ear Infirmary of Mount Sinai Chair
Department of Ophthalmology
Icahn School of Medicine at Mount Sinai

It’s All About ME – What to Know About Macular Edema

“You’ve got the macular? I’ve got some but my sister, she’s got all kinds!” Even as the word retina has become commonplace, the macula and its diseases are often feared and misunderstood. The retina is the light-sensitive layer of cells that line the inside of the eye. The many layers of the retina work together to convert what we see into an exquisitely coded signal that travels to the brain. There the message is decoded and directs us to take action – “that’s a fine looking piece of pie!”

The macula is the part of the retina that helps us see fine detail, far away objects, and color. It’s packed with more photoreceptors than any TV or monitor which is why it is prized real estate. It is the small, central area of the retina that’s worth the most – the bullseye of sight. When things happen to the macula, it gets an “r”. Macular edema, macular degeneration, macular hole, pucker, drusen, scar, fibrosis, hemorrhage, and vitreomacular traction are common conditions that involve the macula. When present, distorted vision (metamorphopsia), blank spots (scotoma), and blurred vision are common symptoms.

Four. Ang. - Macular Edema
Figure 1: Fluorescein angiography: Macular edema may be seen as a pinpoint leak (left, large arrow) in mild cases. In serious cases, ME may diffusely involve the macula. Note how the image becomes brighter as more dye leaks from damaged macular capillaries. (Center and Right)

Macular edema refers to an abnormal accumulation of fluid in the layers of the macula. From the side, it looks like the snake that ate the pig. Like a droplet of water on your computer screen, images are distorted by the swollen retina – making it more difficult to see clearly. The more widespread, thicker, and severe the swelling becomes, more likely one will notice visual symptoms. If untreated, chronic macular edema can lead to irreversible damage to the macula and permanent vision loss.

OCT - Macular Edema
Figure 2: Optical Coherance Tomogrphy and Macular Edema: OCT is a useful test to study macular edema (ME)
-The top image has is normal. Note the even layers and gently sloping dip of the macula called the fovea. This eye has excellent vision.
– The middle OCT has ME, black-appearing cysts (arrows) which threaten the normal fovea. This eye also has good vision.
– The bottom OCT shows ME involving the macula. Because ME involves the macular center (the fovea), vision is poor (large red arrow).

Macular edema is not a disease but the result of one. As with other conditions where abnormal fluid accumulates (leg swelling, pulmonary edema, hives, and allergy), macular edema can be caused by many conditions including metabolic (diabetes), aging (macular degeneration), hereditary (retinitis pigmentosa), inflammatory (sarcoidosis, uveitis), toxic, neoplastic (eye tumors), traumatic, surgical, and unknown causes (idiopathic, macular hole, macular pucker, vitreomacular traction). Macular edema occurs when the retina’s ability to keep fluid out of the retina is overwhelmed by the fluid leaking into it. (If more rain falls on the lawn than it can handle, you get puddles of fluid. In the retina, blisters of fluid form and swell the retina – this is macular edema. Fluorescein angiography (Figure 1) and optical coherence tomography (Figure 2) are two common tests to evaluate macular edema.

Macular edema is typically caused by increased leakage or growth of abnormal blood vessels. The most effective treatment strategies address the underlying cause (diabetes, blood vessel occlusion, neovascularization, inflammation, etc) as well as the hyperpermeability of the capillaries in and around the macula. Eye drops, laser, placement of long-acting medication implants, and surgery are effective in many diseases but the mainstay of treatment is now intravitreal injections (IVI). The IVI is an office procedure painlessly performed under topical anesthesia in which medication is placed inside the eye by a very small needle. IVI should be performed by a trained retina specialist with meticulous monitoring of treatment efficacy and of extremely rare but potentially serious complications. IVI is considered one of the most commonly performed procedure in the world.
Lucentis, Eyelea, and Ozurdex are the trade names of the three most common FDA-approved medications for the treatment of the common conditions causing macular edema. Avastin is not FDA approved but has also been extensively studied in large, well-designed, federally-funded clinical trials and is felt to have efficacy and safety no less than any of the other available options. Each option has a considerable track record of success and works by decreasing the amount of fluid leaking from abnormal blood vessels.

Macular edema is a common finding in many diseases of the retina, most which can be treated to improve vision. The physician’s therapeutic armamentarium continues to expand. There has never been a more successful time in the treatment of macular edema and macular disease. While much has been discovered, many promising therapies await.

3/5/15


Dr. Suber HuangSuber S. Huang, MD, MBA
Chair, National Eye Health Education Program
Philip F. and Elizabeth G. Searle – Suber Huang MD Professor
Case Western Reserve University School of Medicine
Past-President American Society of Retina Specialists
CEO, Retina Center of Ohio

10 Tips For Healthy Eyes

In honor of Save Your Sight Week, here are 10 tips for healthy eyes. There are some simple things you can begin to do today to help your retain your vision. Also there are no warning signs for many of the leading eye diseases (age-related macular degeneration, glaucoma, cataracts), yet most people don’t see an eye doctor until they have a problem seeing. Unfortunately, by that time, irreparable damage has been done.
10 Tips For Healthy Eyes

3/3/15


Susan DeRemerSusan DeRemer, CFRE
Vice President of Development
Discovery Eye Foundation