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How to protect against glaucoma, cataracts

There are simple steps -- including diet, exercise

There are simple steps -- including diet, exercise and sleeping position -- that can help you preserve your eyesight. Photo Credit: Getty images / iStockphoto

Ask Americans to name the ailment they fear most, and blindness ranks at the top, along with Alzheimer’s and cancer, according to a recent survey by the Wilmer Eye Institute at Johns Hopkins University. And yet each year, 50,000 Americans go blind, nearly half from eye diseases that are treatable or preventable.

What’s worse, the number of Americans who are either blind or visually impaired is expected to double by 2050, most of it driven by an aging population and the growing number of people with chronic conditions that can cause vision loss, such as diabetes, says James Jorkasky, executive director of the National Alliance for Eye and Vision Research.

The challenge for vision experts is to make Americans aware of the things they can do to protect their eyesight, including getting a regular eye exam. Only half of the estimated 61 million Americans at high risk of losing their eyesight had an eye exam in the past 12 months — partly due to a lack of insurance coverage for preventive eye care and glasses, noted a National Academies of Sciences, Engineering and Medicine report last fall, but also because many eye diseases don’t show symptoms in the early stages, so people don’t realize they have a problem.

Doctors, too, may need to step up their game. A new study in the journal JAMA Ophthalmology found that in one of four cases, trained eye professionals missed the early, more treatable signs of age-related macular degeneration (AMD) — an irreversible loss of vision that affects 14 million Americans.

There is some good news for those already diagnosed with eye disease, including new treatments and cutting edge research. There are also simple changes everyone can do to greatly reduce their risk of eye disease.

Here’s what you need to know:

  • Glaucoma is caused by a buildup of damaging pressure within the eye and requires a daily dose of medicated eye drops to hold the disease at bay. Unfortunately, getting patients to follow that regimen daily for years is difficult, says Dr. Andrew Iwach, board chairman for the Glaucoma Research Foundation. Instead, clinical trials have started testing a thin polymer ring to be worn in the eye that would slowly release medication throughout the day.

  • Using stem cells to regenerate healthy cells in disease-damaged eyes is the holy grail for researchers. This is especially true for incurable conditions that damage the retina, the layer of light-sensitive cells at the back of the eye.

Earlier this year, a Japanese man became the first person to receive retinal stem cells created from donated skin cells to stop his macular degeneration from getting worse.

And scientists at the Jules Stein Eye Institute at the University of California at Los Angeles report promising results from transplanting stem cells from embryonic cells into patients who had been blind for decades from AMD and another disease. A study in 2014 reported that 10 of the 18 patients who received the cells experienced significantly improved vision.

  • The Argus II, a bionic retina approved by the Food and Drug Administration, is now being used by more than 100 people with retinitis pigmentosa and other related conditions. It also recently was implanted for the first time in a person with macular degeneration. This “bionic eye” uses a tiny camera attached to glasses that sends visual data to a microchip implanted in the eye, which then sends light signals to the brain. So far, the vision it provides is rudimentary, but patients say even some vision can greatly improve the quality of life for a blind person.
  • Here are well-documented things that can help keep your eyes healthy:

Get a dilated-eye exam to detect problems early. Know your family history and whether you’re at risk for eye disease; wear sunglasses to block out ultraviolet rays that can increase the risk of cataracts; and control your diabetes to prevent damage to the retina.

Adjust your yoga and sleep position. Those with glaucoma should avoid head-down positions in yoga (downward facing dog, for example), which can cause a dangerous rise in internal eye pressure, a study last year found. Other studies show that habitually sleeping on one side can cause greater pressure and worsening vision loss in the downward eye.

Add more fish to your diet. The omega-3 oils in fish not only can cut the risk of dry eyes, studies show, but omega-3 fish oil supplements may improve dry eye symptoms.

Turn to vitamin C. A diet high in vitamin C — oranges, red peppers, strawberries, broccoli — may help curb cataracts by 33 percent. British researchers believe vitamin C helps prevent the clouding of the lens that causes cataracts, but their findings only pertain to vitamin C from food, not supplements.

Exercise (and spinach) helps glaucoma. A brisk walk for 20 minutes four times a week can lower the pressure inside the eye, which helps protect the retina, according to the Glaucoma Research Foundation. Adding more dark, leafy greens — spinach, kale — to your diet could help, too. A recent study found that those who ate the most greens were 21 percent less likely to develop glaucoma.

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