noun Ophthalmology.
a condition of the eyes in which sight is normal in the night or in a dim light but is abnormally poor or wholly absent in the day or in a bright light.
Also called day blindness.

1700–10; < Neo-Latin < Greek hēmeralōp- (stem of hēmerálōps having such a condition (hēmer(a) day +al(aós) blind + -ōps having such an appearance) + -ia -ia; cf. -opia

hemeralopic [hem-er-uh-lop-ik] , adjective
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World English Dictionary
hemeralopia (ˌhɛmərəˈləʊpɪə)
Compare nyctalopia Nontechnical name: day blindness inability to see clearly in bright light
[C18: New Latin, from Greek hēmeralōps, from hēmera day + alaos blind + ōps eye]

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American Heritage
Medical Dictionary

hemeralopia hem·er·a·lo·pi·a (hěm'ər-ə-lō'pē-ə)
A visual defect marked by the inability to see as clearly in bright light as in dim light. Also called day blindness.

The American Heritage® Stedman's Medical Dictionary
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