Comparison of the Sphere, Cylinder, Spherical Equivalent and Cylindrical Axis Between the Left and Right Eyes
Sang-Deok Lee
Sang-Deok Lee, Department of Optometry, Gimcheon University, Daehak-Ro Gimcheon-Si Gyeongbuk-Do, Korea, East Asian.
Manuscript received on 10 June 2019 | Revised Manuscript received on 17 June 2019 | Manuscript Published on 22 June 2019 | PP: 758-760 | Volume-8 Issue-8S2 June 2019 | Retrieval Number: H11260688S219/19©BEIESP
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open-access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: The objectives were to examine the difference in and relevance of the sphere, cylinder, cylindrical axis, and SE values between the left and right eyes. Methods/Statistical analysis: The refraction function of KR-9000PW was used to measure the refractive errors of 382 eyes of 191 subjects. For the refractive errors measured, the distribution of the absolute differences between the L&R eyes was analyzed. In addition, correlation analyses were performed to find out the relevance of values between the L&Reyes. Findings: There were no significant differences in the mean values of the sphere, cylinder, cylindrical axis, and SE between the L&R eyes. Looking at the distribution of absolute difference of the refractive errors in the L&R eyes, over 50% of the subjects showed a difference smaller than 0.5D for the sphere, cylinder and SE. Over 80% of the subjects showed a difference smaller than 1D. On the contrary, a difference of 2D or larger was shown in 3.66% of the subjects for the sphere, 1.05% for the cylinder and 3.14% for the SE. The difference in the cylindrical axis was smaller than 20° in 66.05% of the subjects and between 70° and 90° in 8.09%. Also, all refractive errors analyzed showed a high correlation between the L&R eyes. Improvements/Applications: The results on the distribution and relevance of absolute difference of the refractive errors in the L&R eyes can be utilized as basic data for research on binocular vision including anisometropia.
Keywords: Refractive Error, Sphere, Cylinder, Cylindrical Axis, SE, Anisometropia.
Scope of the Article: Analysis of Algorithms and Computational Complexity