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KMID : 1011420090140010031
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Journal of Korean Ophthalmic Optics Society
2009 Volume.14 No. 1 p.31 ~ p.38
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The Effects of Spherical and Aspherical RGP Contact Lenses on Visual Performance
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Kim Soo-Hyun
Kim Jai-Min
Kim Hyun-Jung
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Abstract
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Purpose: This study was to evaluate corneal topography, contrast sensitivity and ocular response of a RGP, back surface aspherical contact lens compared with a spherical contact lens.
Methods: A total 37 subjects were fitted with a spherical lens in right eye and an aspherical in the left eye and were evaluated for changes in corneal topography and contrast sensitivity over a 2-month period.
Results: Thirty-four of 37 subjects completed the 2-month study. The corneal topography did not show differences between spherical and aspherical RGP lenses. The eyes fitted with the aspherical lenses demonstrated a greater reduction in contrast sensitivity compared with their spherical counterparts under photopic condition. Subjects preferred comfort and ocular responses provided by the spherical lens.
Conclusions: Corneal topography when comparing spherical and back surface aspherical RGP lenses did not show any significant difference in the subjects. Spherical RGP lens yields better contrast sensitivity and preference than aspherical RGP lens at photopic condition. Further investigation of aberrations induced by contact lens design is warranted to explain the observed differences in visual performance.
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KEYWORD
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visual performance, contrast sensitivity, corneal topography, preference, spherical RGP Lenses, aspherical RGP Lenses
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