Kings Beach at night
Creative Commons License photo credit: lehcar1477

Nyctalopia (Greek for “night blindness”) is a condition making it difficult or impossible to see in relatively low light. It is a symptom of several eye diseases. Night blindness may exist from birth, or be caused by injury or malnutrition (for example, a lack of vitamin A).

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The most common cause of nyctalopia is retinitis pigmentosa, a disorder in which the rod cells in the retina gradually lose their ability to respond to the light. Patients suffering from this genetic condition have progressive nyctalopia and eventually their daytime vision may also be affected. In X-linked congenital stationary night blindness, from birth the rods either do not work at all, or work very little, but the condition doesn’t get worse.

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Alternative Names:
Eyelid spasm; Eye twitch; Twitch - eyelid

Definition
An eyelid twitch is a general term for involuntary spasms of the eyelid muscles. In some instances, the eyelid may repeatedly close (or nearly close) and re-open.This article discusses eyelid twitches in general.

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Causes

The most common things that make the muscle in your eyelid twitch are fatigue, stress, and caffeine. Once spasms begin, they may continue off and on for a few days. Then, they disappear. Most people experience this type of eyelid twitch on occasion and find it very annoying. In most cases, you won’t even notice when the twitch has stopped.

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If there’s one disability associated with getting older that cannot be overlooked, then the eyes have it. It’s called age-related eye disease (ARED). According to an expert at the National Eye Institute (NEI), four major AREDs — glaucoma, cataract, age-related macular degeneration, and diabetic retinopathy — can creep up silently during your senior years, threatening your vision.

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People ages 65 and older are at greater risk for these diseases, said Dr. Robert Nussenblatt, scientific director of NEI, a part of the National Institutes of Health. However, careful monitoring of your eye health and regular eye examinations can help you see well into old age.

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