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KMID : 1011420190240040433
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Journal of Korean Ophthalmic Optics Society
2019 Volume.24 No. 4 p.433 ~ p.438
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Analysis of Aberration Characteristics of Spectacle Lens Designedby Applying Vertex Sphere
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Lee Soo-Cheon
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Abstract
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Purpose: Corrective lenses for hyperopia were designed using Vertex Sphere, and their optical aberration characteristics and stop positions were estimated through the optimization process. The aim of this study was to obtain indicators for the aberration characteristics and performance evaluation while designing corrective lenses for hyperopia.
Methods: In the initial design, Vertex Sphere was applied on the back surface of the corrective lens for hyperopia of powers of +1.00, +4.00, +8.00, and +11.00 D. The final design was obtained through the optimization process of this corrective lens for hyperopia in combination with a refractive ametropic eye model. The optical aberration characteristic of the schematic eye was compared, and the stop position was determined.
Results: The aberrations were better in the eyes with astigmatism and distortion than in the schematic eye in both the central and peripheral visions. Furthermore, in the final performance evaluation obtained through the optimization process, the values of the modulation transfer function in both the tangential and sagittal planes at a spatial frequency of 7 line pairs/mm in the normal eyes were approximately 30%, 40%, 62%, and 33% at powers of +1.00, +4.00, +8.00, and +11.00 D, respectively.
Conclusions: Corrective lenses for hyperopia were designed using Vertex Sphere, which did not generate the effective refractive power, and their optical aberration characteristics were compared with those of the schematic eyes. To visualize clear images in the peripheral vision, higher curvatures of the lens surface should be considered when designing corrective lenses for hyperopia.
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KEYWORD
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Hyperopia, Model eye, Astigmatism, Field of curvature, Distortion
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