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KMID : 1011420140190030383
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Journal of Korean Ophthalmic Optics Society
2014 Volume.19 No. 3 p.383 ~ p.387
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Changes of Refractive Errors Caused by Corneal Shape and Pupil Size
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Noh Yeon-Soo
Kim Sang-Yeob
Moon Byeong-Yeon
Cho Hyun-Gug
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Abstract
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Purpose: To investigate the effect of corneal unique shape to changes of refractive full corrections when pupil size changes.
Methods: Subjective refraction for monocular full correction was performed to 30 subjects (23.33±1.78 of age, 60 eyes) in two room conditions, 760 lx and 2 lx, respectively. Pupillary diameter was measured in two conditions and the change pattern was analyzed using a peak data of corneal topography.
Results: Pupillary diameter was 3.74~4.00 mm in 760 lx and 5.52~5.90 mm in 2 lx. By comparison with refractive data in 760 lx, those data in 2 lx was changed as follows: more (?) spherical power of 17 eyes (28.3%), more (+) spherical power of 10 eyes (17.7%), more (?) cylinderical power of 17 eyes (28.8%), less (?) cylinderical power of 9 eyes (15.3%), and astigmatic axis rotation of 36 eyes (62.1%). From peak data of corneal topography, the changing pattern of two principal meridians was classified into 4 types.
Conclusions: Expansion of the corneal refractive surface accompanied with pupillary dilation may be a main factor that effects the changing a values of subjective refraction because of unique corneal shape. Therefore, subjective refraction
should be performed under the nearest lighting condition to a main living environment.
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KEYWORD
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Pupil diameter, Corneal shape, Refractive correction
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