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KMID : 1159320150170030343
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Korean Journal of Vision Science
2015 Volume.17 No. 3 p.343 ~ p.354
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Comparison of Higher-Order Aberrations and Visual Quality in Eyes Wearing Aspheric and Spherical Silicone Hydrogel Contact Lenses
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Kim Jeong-Mee
Lee Koon-Ja
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Abstract
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Purpose: To investigate ocular higher-order aberrations (HOAs) and visual quality when wearing aspheric and spherical silicone hydrogel contact lenses.
Methods: Fifty eyes of 25 myopic subjects (24.32±2.87 years; 13 females, 12 males) participated in this study. Each eye was fitted with two silicone hydrogel lenses of the following brands: Biofinity (aspheric design) and Acuvue Oasys (spherical design). Best-corrected visual acuity (VA) with high and low contrast and best-corrected contrast sensitivity (CS) at 3, 6, 12 and 18 cycles per degree (cpd) were measured under photopic and mesopic conditions. A wavefront analyzer was used to measure ocular HOAs for 4-mm and 6-mm pupils in each eye without and with the contact
lenses. All measurements were conducted monocularly by having each subject to wear one lens design per one day during two days.
Results: No statistically significant differences in high contrast or low contrast visual acuity (HCVA or LCVA) were found between the two lens designs under photopic and mesopic conditions. There were no significant differences in CS under photopic or mesopic conditions at other spatial frequencies, although CS under the mesopic conditions at 12 cpd was statistically significant difference between the two lens designs (p=0.012). For ocular HOAs, the level of all HOAs with 4-mm and 6-mm pupils was reduced by two lens designs compared to wearing no lens. Also, there was statistically significant difference in spherical aberration (SA) between the two lens designs within the brands with both pupil sizes (p=0.002, p=0.001, respectively); however, there were no significant differences in any other ocular HOAs between the two lens types with 4-mm or 6-mm pupils.
Conclusion: Aspheric silicone hydrogel contact lenses are not clinically different in visual quality compared with spherical silicone hydrogel contact lenses.
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KEYWORD
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Aspheric silicone hydrogel contact lens, Higher-order aberrations, Spherical aberration, Visual quality
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