In recent years, several aspheric front surface contact lenses have been introduced for the apparent purpose of reducing spherical aberration and thereby increasing visual acuity. In order to theoretically determine if and when the lenses may be of.value, the authors calculated the amount of spherical aberration in various spherical contact lenses . They then discussed several theoretical considerations involving the effects of spherical aberration on the visual system. Based on these considerations and calculation s o f spherical aberration, recommendations concerning the use of front surface aspheric lenses are made.
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