noun Ophthalmology.

  1. 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.


  1. inability to see clearly in bright lightNontechnical name: day blindness Compare nyctalopia


  1. A visual defect marked by the inability to see as clearly in bright light as in dim light.day blindness

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