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KMID : 1159320180200010049
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Korean Journal of Vision Science
2018 Volume.20 No. 1 p.49 ~ p.58
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The Effect of Accommodation Stimulus on Pupil Size and Accommodation Response in Young Myopes Corrected with Soft Contact Lens
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Lim Dong-Kyu
Lee Koon-Ja
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Abstract
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Purpose: We investigated the correlation between changes in pupil size with accommodation stimuli and accommodation response after refractive correction by using soft contact lenses in myopes.
Methods: Participants were young myopes (N=50, 100 eyes; 23.15 ±1.70 years; age range, 20~28 years) and refractive errors were corrected by using soft contact lenses. Pupil sizes were measured with a pupillometer at the modes of scotopic, low and high mesopic condition (light off, 0.3 and 3 lx) at 3.5 m and 25 cm in the 100 lx illuminance condition. Accommodation amplitude was measured with the push-up test, and the accommodation response was measured by using an open field autorefractometer. The changes of pupil size with the accommodation stimulus were analyzed by paired t-test and the correlation between the amount of changes in pupil size with the accommodation stimulus and accommodation amplitude and accommodation response were analyzed by Pearson correlation and the significance level was p<0.05.
Results: Pupil size was significantly increased by accommodation stimulus in uncorrected refractive error in myopia (p<0.05), and significantly decreased after refractive correction with soft contact lenses (p<0.05). After refractive correction, the larger the miosis caused by accommodation stimulus, the smaller the binocular and monocular accommodation responses (p<0.05). However, the percentage of participants shown no difference in pupil size in the lighting condition were 35~37%, and shown mydriasis was 7~11% and the accommodation response of the group not shown miosis was significantly larger than that of the miosis group (p<0.05).
Conclusions: The pupil size in myopes corrected with contact lenses decreased by accommodation stimulus, and the accommodation response was decreased. However, in the participants not shown miosis, accommodation response was more than that of miosis group. This study will be cornerstones to understanding of the asthenopia during near works in the contact lens wearers and the visual function of the multifocal contact lens wearers.
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KEYWORD
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Myopia, Pupil size, Accommodation stimulus, Accommodation response
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