| 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. |

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