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Nyctalopia ( / ˌnɪktəˈloʊpiə /; from Ancient Greek νύκτ- (núkt-) 'night', ἀλαός (alaós) 'blind, invisible', and ὄψ (óps) 'eye'), [1] also called 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 ...
Non-24-hour sleep–wake disorder causes a person's sleep–wake cycle to move around the clock every day, to a degree dependent on the length of the cycle. This is known as free-running sleep. [citation needed] People with the disorder may have an especially hard time adjusting to changes in "regular" sleep–wake cycles, such as vacations ...
Xerophthalmia (from Ancient Greek xērós ( ξηρός) meaning "dry" and ophthalmos ( οφθαλμός) meaning "eye") is a medical condition in which the eye fails to produce tears. It may be caused by vitamin A deficiency, [1] which is sometimes used to describe that condition, although there may be other causes.
Night blindness, on the other hand, which is also referred to as nyctalopia, is a condition in which someone has extreme difficulty or loses the ability to see in the dark or in dimly lit areas.
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Neurology. Refsum disease is an autosomal recessive [5] neurological disease that results in the over-accumulation of phytanic acid in cells and tissues. It is one of several disorders named after Norwegian neurologist Sigvald Bernhard Refsum (1907–1991). [6] [7] Refsum disease typically is adolescent onset and is diagnosed by above average ...
Vitamin A deficiency ( VAD) or hypovitaminosis A is a lack of vitamin A in blood and tissues. [1] It is common in poorer countries, especially among children and women of reproductive age, but is rarely seen in more developed countries. [1] Nyctalopia (night blindness) is one of the first signs of VAD, as the vitamin has a major role in ...
Retinol, also called vitamin A1, is a fat-soluble vitamin in the vitamin A family that is found in food and used as a dietary supplement. [2] Retinol or other forms of vitamin A are needed for vision, cellular development, maintenance of skin and mucous membranes, immune function and reproductive development. [2]
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