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http://dx.doi.org/10.14479/jkoos.2014.19.3.383

Changes of Refractive Errors Caused by Corneal Shape and Pupil Size  

Noh, Yeon Soo (Dept. of Optometry, Kangwon National University)
Kim, Sang-Yeob (Dept. of Optometry, Kangwon National University)
Moon, Byeong-Yeon (Dept. of Optometry, Kangwon National University)
Cho, Hyun Gug (Dept. of Optometry, Kangwon National University)
Publication Information
Journal of Korean Ophthalmic Optics Society / v.19, no.3, 2014 , pp. 383-387 More about this Journal
Abstract
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 ($23.33{\pm}1.78$ 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.
Keywords
Pupil diameter; Corneal shape; Refractive correction;
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Times Cited By KSCI : 5  (Citation Analysis)
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