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KMID : 1159320160180010001
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Korean Journal of Vision Science
2016 Volume.18 No. 1 p.1 ~ p.7
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Changes in corneal curvature according to accommodation
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Park Chang-Won
Kim Hyo-Jin
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Abstract
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Purpose: The purpose of this study was to determine the changes in corneal curvature according to accommodation in normal human eyes.
Methods: One hundred thirty two eyes of 66 healthy volunteers who had normal accommodative with a mean age of 14.45±8.23 were enrolled in this study. Measurements of refractive error were performed using a internal fixation target type
auto-refractor. The distances from subjects to targets in using the open view target type auto-refractor were 40 cm and 4 m. Used open view target type auto-refractor to measure refractive error and central cornea K when fixing eyes on a far point and a near point, and distinguished the measurement of Cornea curvature by the power of maximum K, minimum K and the direction of maximum K. Subjects were analyzed that changes in corneal curvature according to age(group 1 and 2).
Results: At baseline, the mean of refractive errors of the eyes was by group 1(-1.03±1.12 D) and group 2(?1.35±0.98 D). In the group 1, maximum K values significantly increased between far and near distance(p<0.05). However, group 1 of minimum K values and maximum K direction were not significant difference according to fixation distance(p>0.05). When fixing eyes on a near point, the power of maximum K, minimum K and the direction of maximum K were not significant difference in the group 2(p>0.05).
Conclusions: No statistically significant relationship was found between cornea curvature and accommodation in the group 2. For the group 1, the power of the maximum K was tend to steeper changes.
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KEYWORD
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corneal curvature, maximum K, minimum K, accommodation
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