A person who experiences hemeralopia; someone who has normal or better-than-normal vision in daylight but cannot see well in dim light.
From Greek 'hemera' (day) and 'alops' (blind). The term literally means 'day-blind' but actually refers to the opposite—inability to see in darkness while having good day vision.
It's one of medicine's great ironies: 'hemeralope' literally means 'day-blind' but describes someone who sees perfectly fine in daylight—the name stuck despite actually meaning the reverse of the condition!
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