Hereditary visual impairment in a new mutant strain of chicken, GSN/1.

Visual pathways of a new mutant of chicken (GSN/1) with hereditary visual impairment were ophthalmologically, electrophysiologically, and histopathologically examined. Clinically, GSN/1 chickens drooped and had decreased locomotor activity. As an indicator of visual acuity, the spatial frequency characteristics of GSN/1 chickens showed poor scores at high frequency.