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    Night Vision Problems: Halos, Blurred Vision, and Night Blindness

    Are you having problems with night vision? Millions of Americans do. Poor night vision may simply be an early sign of progressive cataracts. Problems with night vision -- or at the extreme, night blindness -- may be treatable or could be a sign of a congenital problem such as retinitis pigmentosa or other more serious conditions. On the other hand, poor night vision may simply be a sign of an untreated need for glasses, especially if you are nearsighted.

    What Causes Poor Night Vision?

    Difficulty with night vision can stem from conditions ranging from exposure to the sun and vitamin deficiencies to a chronic disease such as diabetes:

    • Cataracts. The lens of the eye is located behind the pupil. Over a lifetime, the process of cell turnover inside the lens produces debris that gradually builds up. This creates a cataract. Painless and progressive, cataracts slowly cloud the lens. The first symptom of cataracts is often decreased night vision. The light distortion caused by cataracts also frequently produces halos around lights -- again, mostly at night. Blurry vision is also common.
    • Vitamin A deficiency . Vitamin A is an essential vitamin that's found in carrots and yellow or green leafy vegetables. It helps keep the retina -- in the back of the eye -- healthy. Vitamin A deficiency is a rare cause of night blindness in the U.S. It occurs mostly in people with problems absorbing nutrients from the gastrointestinal tract. This might occur as a result of different diseases and conditions such as Crohn's disease, celiac disease, cystic fibrosis, gastric bypass surgery for obesity, or pancreatic insufficiency.
    • Zinc deficiency. Zinc works in the eye as a partner to vitamin A. Without zinc, the vitamin A that's present may not be as effective, and night blindness could result. Beef, poultry, beans, and nuts are rich sources of zinc. This dietary deficiency is uncommon in this country.
    • Retinitis pigmentosa . Retinitis pigmentosa is an uncommon genetic disorder. It affects young people, usually before age 30. Worsening night vision is often the earliest symptom. Variable amounts of vision loss follow, although most people retain some eyesight.
    • Sunlight exposure. If your night vision seems temporarily worse after a trip to the beach, it probably is. Sustained bright sunlight can impair night vision for up to two days. Wear your sunglasses regularly to avoid this cause of poor night vision.
    • LASIK surgery problems. Complications after LASIK surgery are uncommon. However, a rare patient will experience night vision problems after LASIK. The most common complaint is distorted vision in the form of glare and halos around objects. Symptoms may be present during the day, too. They become more noticeable and bothersome, though, at night. Some people are more prone to developing night vision problems after LASIK. Those who are can be identified before the surgery based on characteristics of their eyes. Ask about your own chances of poor night vision if you're considering LASIK.
    • Diabetes. People with diabetes are at higher risk for night vision problems. Over years, high blood sugar is toxic to the blood vessels and nerves in the eye. The retina -- the back of the eye where images are focused -- is gradually damaged (retinopathy). Two early signs of retinopathy from diabetes are poor night vision and taking a long time to see normally after coming indoors from bright light outside.

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