title: Influence of lid position on astigmatism.
abstract: The influence of 3 different lid positions on the astigmatism of 50 young healthy eyes was investigated with an autorefractor. The results showed that a significant amount of astigmatism may be induced when the palpebral aperture is voluntarily narrowed.
mesh_terms: D000293:Adolescent; D000328:Adult; D001251:Astigmatism / Q000209:etiology*; D005143:Eyelids / Q000502:physiology*; D006801:Humans; D011312:Pressure; D012029:Refraction, Ocular