Nyctalopia
Night blindness, impaired vision in dim light and in the dark, due to impaired function of certain specialized vision cells (the rods) in the retina.
“Nyctalopia” comes from the Greek “nyct” (night) + “aloas” (obscure or blind) + “opsis” (vision). Nyctalopia is also called day sight, nocturnal amblyopia, and nyctanopia.
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- Nyctanopia
Impaired vision in dim light and in the dark, due to impaired function of the rods in the retina. Nyctanopia is a classic finding with vitamin A deficiency. Also known as day sight, nocturnal amblyopia, and nyctalopia.
- Nyctophobia
Pathological fear of the dark.
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- Nystagmus
Rapid, rhythmic, repetitious, and involuntary eye movements. Nystagmus can be horizontal, vertical, or rotary. Whatever form it takes, nystagmus is an abnormal eye finding and a sign of disease within the eye or the nervous system.
- Nomenclature
A system of names used in a particular discipline, as in medicine and surgery, anatomy and biochemistry, etc. A standard system of nomenclature presupposes the existence of an organized classification of the entities within that field. From the Latin nomenclatura, a listing of names, from nomen, name, + calo, to proclaim. The USSR and other […]