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Proceedings Paper

Geometric Optics In Ophthalmic Lens Design
Author(s): John K. Davis
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Paper Abstract

The task of designing an ophthalmic corrective lens is one of optimizing a system by modifying only a fixed front element with remainder of the system rotatable about the stop point. Commercial designs date from the first part of the century. Two schools of thought, which still persist, governed the thinking and design work: Whether to correct astigmatism or to control field curvature. These meridional off axis errors have been the primary concern of ophthalmic lens designers, and considered mainly for distant object points. Geometric Optics has played a minor role in bifocal design except for research in the area of unsegmented multifocal lenses of continuously varying power. A design project today, made practical by computers and plotters, is one of optimizing a series of several hundred compatible lenses with consistent, logical tolerances, trade-offs and priorities applied to a range of fitting and object dis-tances. The magnitude of errors involved varies with the task from a few hundredths of a diopter in some prescriptions to several diopters in aphakic and low vision corrections. Aspherics work wonders with such lenses. The acceptance of hard resin lenses, has also made aspherics practical for ordinary prescriptions. This allows consideration of additional criteria such as distortion and cosmetic appearance.

Paper Details

Date Published: 1 March 1974
PDF: 36 pages
Proc. SPIE 0039, Applications of Geometrical Optics II, (1 March 1974); doi: 10.1117/12.953776
Show Author Affiliations
John K. Davis, American Optical Corporation (United States)

Published in SPIE Proceedings Vol. 0039:
Applications of Geometrical Optics II
Warren J. Smith, Editor(s)

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