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Updated: Jun 17, 2026

Correction of Presbyopia by Monocular Bi-Aspheric Ablation Profile
Published on: September 20, 2024
Wide angle lenses with aspheric correcting surfaces
1Avco Everett Research Laboratory, Everett,Massachusetts 02149, USA.
Abstract:
Refracting elements having aspheric correcting surfaces near the center of curvature are analyzed. As in the case of the Schmidt reflector, such systems can have a wide aperture and a wide field of view; in addition, they are free from obstructing surfaces. Being uncorrected for dispersion, however, the refracting systems are restricted to nearly monochromatic radiation. Typical forms of the correcting surfaces have been determined, both by third-order theory and by numerical integration of exact equations.
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