1) Nyctalopia 
failure of the eye to adapt promptly from light to darkness that is characterized by a reduced ability to see in dim light or at night. It occurs as ... [2 related articles]
Failure or imperfection of vision at night or in dim light, with good vision only on bright days. ... (12 Dec 1998) ... 
inability or a reduced ability to see in dim light, and slowness at adjusting from brightness to dimness. Dim light produces a change in a pigment called rhodopsin in the rods of the retina, causing nerve impulses to travel to the brain and make visual impressions. Night blindness occurs when the rods lack rhodopsin; a co...
Type: Term Synonyms: nyctalopia
Night blindness: Impaired vision in dim light and in the dark, due to impaired function of specific vision cells (namely, the rods) in the retina. The ability of our eyes to quickly view objects as they shift from light to dark areas and the ability to see in dim light or at night is an important part of our visual health. When we are not able to d...
a condition of the eyes in which vision is normal in daylight but abnormally poor at night or in a dim light; nyctalopia.