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KMID : 0360220130540111680
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Journal of the Korean Ophthalmological Society
2013 Volume.54 No. 11 p.1680 ~ p.1687
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Preoperative Ocular Aberrations Measured by Zywave® II Aberrometer in Individuals Screened for Refractive Surgery
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Kim Young-Seung
Ko Byung-Yi
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Abstract
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Purpose: To report the distribution of ocular higher-order aberrations in candidates for refractive surgery measured by Zywave® II aberrometer.
Methods: The present study included 232 eyes of 116 subjects. Ocular aberration data were obtained by measurements per eye using Zywave® II aberrometer. The mean Zywave spherical equivalent (SE) and higher order aberrations (HOAs) calculated in the central 6-mm zone and expressed as root mean square (RMS) values were analyzed. Correlation analysis was performed to assess the association between ocular HOAs and gender, age, SE refractive error, or central corneal thickness (CCT) and investigate the aberration symmetry between right and left eyes.
Results: The average SE was -4.67 ± 1.83 diopters (D). The mean RMS values of total HOA, 3rd, 4th or 5th summated HOAs, coma, trefoil and spherical aberration (SA) were 0.421 ± 0.201 μm, 0.346 ± 0.206 μm, 0.202 ± 0.105 μm, 0.087 ± 0.048 μm, 0.241 ± 0.172 μm, 0.225 ± 0.154 μm and 0.136 ± 0.102 μm, respectively. There was no significant differences of the mean total HOA, summated HOAs, coma, trefoil and SA between genders, age and refractive errors, but the 3rd order trefoil was strongly related with myopia (r = -0.900, p = 0.008). There was symmetry of ocular aberrations between both eyes and the ocular aberrations were not correlated with CCT.
Conclusions: Herein, we report the normative distribution of ocular aberrations in the myopic Korean population measured by Zywave® II aberrometer. The 3rd order trefoil and myopia were correlated and mirror symmetry was observed between right and left eyes.
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KEYWORD
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Normative distribution, Ocular aberrations, Refractive surgery candidates, Symmetry
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