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Experimental investigation reveals that lid position affects astigmatism in young healthy eyes, suggesting a link between eyelid movement and vision.
The influence of 3 different lid positions on the astigmatism of 50 young heathy 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.
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Grey et al. (1986) studied this question.
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