Contrast sensitivity with soft contact lenses compensated for spherical aberration in high ametropia

In optical systems, it is usual to compensate for longitudinal spherical aberration. In order to increase image quality, lens surfaces can be made aspheric to bring all object light rays into focus at the image plane. Theoretically, soft contact lenses with high power and spherical surfaces show sig...

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Veröffentlicht in:Optometry and vision science 1998, Vol.75 (1), p.37-43
Hauptverfasser: DE BRABANDER, J, CHATEAU, N, BOUCHARD, F, GUIDOLLET, S
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container_title Optometry and vision science
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creator DE BRABANDER, J
CHATEAU, N
BOUCHARD, F
GUIDOLLET, S
description In optical systems, it is usual to compensate for longitudinal spherical aberration. In order to increase image quality, lens surfaces can be made aspheric to bring all object light rays into focus at the image plane. Theoretically, soft contact lenses with high power and spherical surfaces show significant amounts of spherical aberration. The use of spherical aberration-free soft contact lenses could therefore improve retinal image quality in the case of high ametropia. However, because of ocular aberration, accommodation effects, pupil dynamics, contact lens flexure, and positioning, the computation of the spherical aberration induced when a contact lens is placed on the eye is complicated. In this study, the spatial contrast sensitivity (CS) of 61 high ametropes wearing soft contact lenses with, and without, in-air spherical aberration compensation is measured. A slightly better overall performance was found with the standard lenses. There was no significant influence by the type of ametropia, age, and gender. If individual results are considered, clinically significant differences between the two lens groups are observed in approximately 30% of the cases. It seems that correcting in-air soft contact lens spherical aberration systematically is of no clinical interest. However, selective manipulation of spherical aberration could, in high power soft contact lenses, significantly improve CS in individuals.
doi_str_mv 10.1097/00006324-199801000-00023
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source MEDLINE; Journals@Ovid LWW Legacy Archive; Free E-Journal (出版社公開部分のみ); Journals@Ovid Complete
subjects Aberrations
Adolescent
Adult
Biological and medical sciences
Contact Lenses, Hydrophilic
Contrast Sensitivity - physiology
Cross-Over Studies
Double-Blind Method
Female
Humans
Hyperopia - physiopathology
Hyperopia - therapy
Male
Medical sciences
Middle Aged
Myopia - physiopathology
Myopia - therapy
Ophthalmology
Optics and Photonics
Vision
Vision disorders
title Contrast sensitivity with soft contact lenses compensated for spherical aberration in high ametropia
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