Inability to wink an eye and eye dominance.
Data from 56 subjects in Grades 4 to 12 only able to wink one eye indicated that the non-winking eye was used as the dominant one in tests on monocular and binocular sighting.
D000124:Achievement; D000293:Adolescent; D002648:Child; D005143:Eyelids / Q000502:physiology*; D007839:Functional Laterality; D006801:Humans; D014787:Vision Tests