The optic condition nyctalopia, the inability to see clearly in faint light, as at night

Describing an experiment (usually medical) in which some information which might influence the experiment is withheld from two parties. Most commonly, parties in question are the subjects and the administrators and the information which is withheld is the treatment groups of the subjects.

Onchocerciasis.

(British spelling) Alternative form of colour blind

British spelling spelling of color blind

(American spelling) Alternative form of color blind

(of a person or animal) Unable to distinguish between two or more primary colors (usually red and green).

A painful condition of the eyes caused by exposure of unprotected eyes to the ultraviolet (UV) rays in bright sunlight reflected from snow or ice.

(medicine) Unable to see clearly in bright light; hemeralopic

Alternative spelling of night-blind