nvCJD
New variant Creutzfeldt-Jakob disease.
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- 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.
- 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.
- Nymph
A stage in the life cycle of certain arthropods, such as ticks and lice. The nymph stage is between the nit and the adult louse stages. A nymph louse looks like an adult but is smaller. Nymphs mature into adults about 7 days after hatching. To live, the nymph must feed on blood.
- 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.