Traveling With Low Or No Vision

What Good is Sitting Alone in Your Room?

Traveling with low or no vision

There is a whole world out there to discover — regardless of whether you can see it all with your eyes. No one will tell you traveling with low or no vision does not present challenges, but there are precious few that cannot be overcome with planning, creativity and patience.
Traveling with low or no vision
A plethora of for-profit and nonprofit companies exist to help you navigate the complexities of traveling with a vision disability — from technology and websites, to travel agents and tour operators. And don’t overlook helpful — and free! — resources such as your friends and family, assistance pets and even complete strangers.

Travel Tools
Everyday tools become even more essential when you are traveling in unfamiliar surroundings. A mobility cane (consider a small travel version) will let you find your way more easily — and notify others of your vision issues. This is especially helpful for two reasons: Strangers are less likely to get in your way and more likely to help if you ask for it. In a recent DEF blog post (“Visual Aids and Techniques When Traveling”

Linda Becker, who has retinitis pigmentosa (RP) and travels primarily with her guide dog, is planning her next trip to Australia and New Zealand with Mind’s Eye Travel, a company that specializes in creating tours especially for people who are blind or visually impaired, as well as providing sighted guides. There are many such companies that will assist you with all facets of travel, from immigration documents to reservations to tour guides. Traveleyes offers discounts to sighted travelers in exchange for helping guide non-sighted travelers during group vacations around the world. DisabledTravelers.com is a good resource for companies that specialize in travel for people with accessibility issues. It includes reviews and recommendations on everything from airlines and cruises, to travel agents and hotels.

Plan, Prep, Pack
Ask any experienced low-vision traveler, and they will tell you planning, planning and more planning is the key to successful travel. Not only will it make your trip go more smoothly, it will give you peace of mind, as well as the ability to relax and enjoy yourself. The fewer surprises, the more confident and comfortable you will feel. And if something does goes awry, it is easier “go with the flow,” because everything else has been planned.

Right at the top of the list with planning is, well, making a list. Prepare a list of all the items you will need, then double it. That means if you wear contact lenses, pack at least one extra pair, as well as cleaning solutions. Same goes for glasses and sunglasses. Make sure you have plenty of the medications and other supplies you use on a day-to-day basis. Most seasoned travelers suggest you have multiples of all these stashed in different bags: your carry-on, your suitcase and a handbag of some kind that never leaves your side. This way, if one bag gets lost, you still have another one or two. Sample sizes may become your best friend!

Carolyn Hammett, an accomplished photographer and world traveler who has keratoconus (KC), advises: “Be prepared; having backups makes you more comfortable. Be ready to change contact lenses in public restroom if you need to. Have one of everything you need, vision-wise, with you at all times.” To learn more about Hammett and see what she packs for a two-week trip, see “Through a Lens with One Eye Blind,” a story from our recent e-newsletter focused on travel experiences and tips.

“Leave extra time, notify airlines or others in advance that you may need assistance, and don’t be afraid to ask for help,” says Adam Lawrence, who also has RP and travels regularly with his guide dog. (Read more about traveling with guide dogs in “Traveling Tails”, from an article in our recent e-newsletter.

Speaking of help, don’t forget the helper sitting next to you right now, whether it’s a spouse, a friend or a guide dog. Traveling alone can be vexing for people with full vision, so it’s natural for those with low vision to feel even more anxiety.

Dame Judi Dench, who has age-related macular degeneration (AMD), recently told Radio Times she no longer travels alone. “I need someone to say, ‘Look out, there’s a step here!’ or else I fall all over the place like a mad, drunk lady,” she said.

“Don’t travel by yourself the first time — go with someone you trust, and let them know how much help you want,” Hammett says. “I’ve gotten to the point where I tell my husband, ‘Don’t tell me anything until I screw up.’”

With planning, preparation and practice, you may get to a point where you feel comfortable traveling alone. You will only know your limitations if you try to stretch them.

“Just try,” Hammett says. “Do it once to find out if you can.”

Additional Resources

Access-Able Travel Source’s “Travel Tips for People Who are Blind or Visually Impaired”

Society for Accessible Travel & Hospitality

Transportation Security Administration’s “Passengers Who Are Blind or Have Low Vision”

5/14/15

LH1_RESCANLauren Hauptman
Lauren Hauptman INK

Famous People with Vision Loss – Part II

Here is part two of our look at famous people with vision loss. The focus this time is the creative minds of artists, actors and musicians.

Artists

Georgia O’Keeffe (1887-1986) – Best known for her paintings of enlarged flowers, New York skyscrapers, and New Mexico landscapes, she was recognized as the “Mother of American modernism”. In 1972, O’Keeffe’s eyesight was compromised by age-related macular degeneration (AMD), leading to the loss of central vision and leaving her with only peripheral vision. She stopped oil painting without assistance in 1972, but continued working in pencil and charcoal until 1984.

Claude Monet (1840-1926) – A French impressionist painter who had cataracts that blurred his vision and caused a severe loss of color perception. After complaining about his cataracts for ten years, he had cataract surgery in 1923. Those paintings before the surgery have more of a reddish tone, while those painted before his cataracts and after the surgery show more blue tones.

Edgar Degas (1834-1917) – A French artist known for his paintings, sculptures, prints, and drawings. He had a chronic and progressive retinal disease that made him sensitive to light and caused him to lose his central vision. Frustrated by these limitations he switched to oil pastels because less precision was needed. He finally resorted to sculpting to be able to utilize his sense of touch and feeling in order to continue to create art.

Actors

Johnny Depp (1963-) – Known for his many movie roles, Depp doesn’t let his vision loss stop his career. Besides correcting his blurred vision, the tinted lenses of the glasses he wears also help with Meares-Irien ‘visual stress’ syndrome, which causes dizziness, discomfort and eye pain. He is also nearly blind in his left eye.

Issac Lidsky (1979-) – A child actor known for his part in the Saved by the Bell: The New Class TV series, he was diagnosed with retinitis pigmentosa (RP) at 13 and was completely blind by 25 years of age. He changed the course of his career, becoming a lawyer. He was a law clerk for Justices Sandra Day O’Connor and Ruth Bader Ginsburg in 2008-09, making him the the first blind US Supreme Court clerk.

Jon Weller (1975-) – A TV actor who has performed on many shows, he is best known for his recurring role of toxicologist Henry Andrews on CSI: Crime Scene Investigation. He has been diagnosed with RP.

Dame Judith Dench (1934-) – A actress has had a long career in theater and film, receiving many awards including ten BAFTAs, six Olivier Awards, two Screen Actors Guild Awards, two Golden Globes, an Academy Award, and a Tony Award. She is well-known for the part of M in the James Bond series of films. In 2012 She announced that she has age-related macular degeneration (AMD), but has no intentions of slowing down. Scripts are now provided to her in a larger font.

Musicians

Ray Charles (1930-2004) – He was born with congenital glaucoma which resulted in blindness by the age of 7. This American singer, songwriter, musician and composer, received multiple Grammys, was inducted into the Rock and Roll Hall of Fame and a Kennedy Centers Honoree.

Stevie Wonder (1950-) – He is a singer-songwriter, multi-instrumentalist and record producer who signed with Motown Records at the age of 12. He has won 25 Grammys and received the Grammy Lifetime Achievement Award. He is blind due to retinopathy of prematurity due to excessive oxygen in his incubator when he was born.

Andrea Bocelli (1958-) – An Italian classical tenor, he was born with congenital glaucoma, but lost his vision at the age of 12 following a soccer accident in which he was hit in the head. He started playing piano when he was six, also learning the saxophone and flute. Bocelli has recorded fourteen solo studio albums, of both pop and classical music, three greatest hits albums, and nine complete operas, selling over 75 million records worldwide, making him one of the best-selling music artists of all time.

Ella Fitzgerald (1917-1996) – An American jazz singer often referred to as the First Lady of Song. She also appeared on TV and in movies. She won 14 Grammy Awards, National Medal of Arts and the Presidential Medal of Freedom. She was diagnosed later in life with diabetic retinopathy due to her advanced diabetes, which also cost her both legs.

Do you know of any creative famous people You could add to this list? Please share them below in the comments.

4/30/15

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

Famous People with Vision Loss – Part I

With all the recent news about Rosanne Barr’s vision loss due to age-related macular degeneration (AMD) and glaucoma, I thought it would be interesting to see other famous people with vision loss who didn’t let it stop their impact on the world around them. Today’s post will focus on writers, politicians, business and military leaders, scientists. Thursday we will explore artists, actors and musicians.

Authors

Harper Lee (1926-) – Best known for her 1960 Pulitzer Prize winning book To Kill a Mockingbird, she has been diagnosed with AMD. Her second novel, Go Set a Watchman, which was actually written before To Kill a Mockingbird, will be published this July.

John Milton (1608-1674) – English poet who wrote the poem Paradise Lost, among others, and became blind at the age of 43.

Alice Walker (1944-) – American author and activist who wrote The Color Purple which won the Pulitzer Prize and the National Book Award in 1983. She was blinded in one eye as a child when shot with a BB gun.

Joseph Pulitzer (1847-1911) – American newspaper publisher who established the prestigious journalism award, the Pulitzer Prize. He became blind at the age of 42 due to a retinal detachment.

James Thurber (1894-1961) – American humorist who switched his attention from sports to writing when his brother shot him in the eye with an arrow while recreating the legend of William Tell shooting the apple off his son’s head.

James Joyce (1882-1941) – Irish novelist and poet who had numerous eye surgeries for various conditions starting with iritis.

Stephen King (1947-) – American author of contemporary horror, supernatural fiction, suspense, science fiction, and fantasy. He has been diagnosed with AMD.

Leaders

Horatio Nelson (1758-1805) – British naval admiral lost an eye as a young seaman. He was said to have used this to his advantage by raising his telescope to his blind and then claim not to see the flags of surrender being raised by enemy ships.

Thomas Gore (1870-1949) – Blinded as a child, he became the first senator from Oklahoma and the first blind member of the US Senate.

Steve Wynn (1942-) – A well-known business leader having helped build up Las Vegas, and the owner of The Wynn and The Encore resorts, he was diagnosed with retinitis pigmentosa in 1971 and declared legally blind in 2010.

David Alexander Paterson (1954-) – He was the first African American Governor of New York and the second legally blind governor of any state, after Bob Riley of Arkansas. Paterson became blind at the age of three months when an ear infection spread to his optic nerve.

Willie Brown (1934-) – He spent over 30 years in the California State Assembly and served as the first African American Mayor of San Francisco for eight years. He has retinitis pigmentosa.

Hellen Keller (1880-1968) – She was an American activist, lecturer and author. She was the first deaf/blind person to graduate from college. At the age of 19 months she came down with infection that left her deaf and blind. She inspired the Lions Clubs International to become “knight of the blind,” leading them to focus their community service efforts toward vision-related causes.

Science & Medicine

Dr. Jacob Bolotin (1888-1961) – Was the first congenitally blind person to receive a medical license. This Chicago physician’s specialties were diseases of the heart and lungs.

John Glenn (1921-) – He was the first man to orbit the earth in 1963 on the Friendship 7 mission. He suffers from glaucoma.

Joseph Plateau (1801-1883) – Belgian physicist who invented an early stroboscopic device, the phenakistiscope, in 1836 that allowed still images to create an animated effect. It eventually led to the development of cinema. He performed an experiment in which he gazed directly into the sun for 25 seconds, leading to his eventual blindness.

Join us next Tuesday for part two.

4/28/15

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

Your Comprehensive Eye Exam

Your Comprehensive Eye Exam

Being able to see clearly is important to all of us. But it is also something we have a tendency to take for granted until we notice changes in our vision. The point of the yearly comprehensive exam is to monitor your eyes before any problems arise, and address any concerns that could affect your vision later. Here is what to expect at your next comprehensive eye exam.

An eye exam involves an external examination of your eyes followed by a series of tests designed to evaluate your vision and check for eye diseases. Each test evaluates a different aspect of your vision and includes specific tests for visual acuity, pupil function, muscle function, visual fields, eye pressure and viewing the back of the eye through a dilated pupil.
cross section of eye - eye exam
External Exam
The external examination consists of inspecting the eyelids, surrounding tissues and the eyeball including the sclera (white part of the eye), iris and cornea.

Visual Acuity & Fields
Visual acuity is your eye’s ability to detect fine details and see an in-focus image at a certain distance. A Snellen chart and a phoropter are used. The standard definition of normal visual acuity is 20/20. The term 20/20 comes from even sized objects that can be seen by a “person of normal vision” atvisual acuity eye exam the specified distance. For example, if a person can see at a distance of 20 feet an object that normally can be seen at 20 feet, then they have 20/20 vision. If they can see at 20 feet what a normal person can see at 40 feet, then they have 20/40 vision. For the visual acuity test each eye is tested separately to gauge your side or peripheral vision.

Pupil Functionpupil function eye exam
An examination of the pupil begins with inspecting your pupils for equal size, regular shape, reaction to light, and direct and consensual reaction (meaning the pupil of one eye constricts when the other eye is exposed to light).

Eye Muscle Function
Eye movement is assessed two ways. First by having you move your eye quickly to a target at the far right, left, top and bottom. Then by slow tracking which uses the ‘follow my finger’ test, which tests all the muscles that move your eye.

tonometer eye examEye Pressure Measurement
Intraocular pressure, or IOP, is measured using a tonometer to determine the fluid pressure inside your eye. This test provides information regarding your potential for glaucoma.

Viewing the Back of the Eyedilated eye - eye exam
Increasing the size of your pupil with eye drops (known as dilating your eyes) allows the doctor to have a larger view of the back of your eye, including the retina, as demonstrated by this diagram. This is very important for diagnosis and tracking of macular degeneration and diabetic retinopathy.

Eye Structureslit lamp eye exam
A special, high-powered microscope, called a slit-lamp, is used to view the structures of your eye clearly and in detail, enabling early diagnosis of a variety of eye conditions such as cataracts, presbyopia and corneal injury.

Taking care of your eyes, especially as you become older, is very important. Changes in vision may be gradual, or fast, but in both cases, early diagnosis is key to successful treatment and retaining your vision. It is suggested that individuals 40 and over have a comprehensive eye exam every one to two years. Exceptions would be if you have diabetes, in which case you should see your eye doctor yearly; or there is a family history of eye diseases such as glaucoma, macular degeneration, or corneal diseases, which may require more frequent visits to your eye doctor. If you have any degree of sudden vision loss, eye pain, or significant irritation, contact your eye doctor immediately.

4/23/15

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

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

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

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

February Is Low Vision Awareness Month

Help for People With Vision Loss

Here’s eye-opening news: Currently, 4.2 million Americans ages 40 and older are visually impaired. Of these, 3 million have low vision. By 2030, when the last baby boomers turn 65, the number of Americans who have visual impairments is projected to reach 7.2 million, with 5 million having low vision. For the millions of people who currently live or will live with low vision, the good news is there is help.
Low vision awareness
But first, what is low vision? Low vision is when even with regular glasses, contact lenses, medicine, or surgery, people have difficulty seeing, which makes everyday tasks difficult to do. Activities that used to be simple like reading the mail, shopping, cooking, and writing can become challenging.

Most people with low vision are age 65 or older. The leading causes of vision loss in older adults are age-related macular degeneration, diabetic retinopathy, cataract, and glaucoma. Among younger people, vision loss is most often caused by inherited eye conditions, infectious and autoimmune eye diseases, or trauma. For people with low vision, maximizing their remaining sight is key to helping them continue to live safe, productive, and rewarding lives. The first step is to seek help.

“I encourage anyone with low vision to seek guidance about vision rehabilitation from a low vision specialist,” advises Paul A. Sieving, MD, PhD, director of the National Eye Institute (NEI), one of the National Institutes of Health (NIH) and the federal government’s principal agency for vision research.

What is a low vision specialist? A low vision specialist is an ophthalmologist or optometrist who works with people who have low vision. A low vision specialist can develop a vision rehabilitation plan that identifies strategies and assistive devices appropriate for the person’s particular needs. “A vision rehabilitation plan helps people reach their true visual potential when nothing more can be done from a medical or surgical standpoint,” explains Mark Wilkinson, O.D., a low vision specialist at the University of Iowa Hospitals and Clinics and chair of the low vision subcommittee for the National Eye Health Education Program (NEHEP).

Vision rehabilitation can include the following:

  • Training to use magnifying and adaptive devices
  • Teaching new daily living skills to remain safe and live independently
  • Developing strategies to navigate around the home and in public
  • Providing resources and support

There are also many resources available to help people with low vision. NEI offers a 20-page, large-print booklet, titled What You Should Know About Low Vision, and companion DVD, featuring inspiring stories of people living with low vision. This booklet and DVD, among other resources, are available at
www.nei.nih.gov/lowvision.

With the aging of the population, eye diseases and vision loss have become major public health concerns in the United States. NEI is committed to finding new ways to improve the lives of people living with visual impairment. Aside from making information and resources readily available, NEI has dedicated more than $24 million to research projects on low vision, including learning how the brain adapts to vision loss; strategies to improve vision rehabilitation; and the development of new technologies that help people with low vision to read, shop, and find their way in unfamiliar places. Research like this will help people with low vision to make the most of their remaining vision and maintain their independence and quality of life.

2/17/15

NEHEPsq75The National Eye Health Education Program (NEHEP) of the National Eye Institute (NEI), a part of NIH, offers a 20-page, large-print booklet, titled What You Should Know About Low Vision, and a series of videos featuring patient stories about living with low vision. These and other resources are available at http://www.nei.nih.gov/lowvision.