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1. Inability to see clearly in dim light; due to a deficiency of vitamin A or to a retinal disorder
   - nyctalopia, night blindness
    
2. Recurrent eye inflammation in horses; sometimes resulting in blindness
   - mooneye

Type of: animal disease, avitaminosis, hypovitaminosis, vision defect, visual defect, visual disorder, visual impairment

Encyclopedia: Moon blindness