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Proceedings Paper

Estimation of the clinical significance of changes to the optics of the eye
Author(s): Alan J. Lang; Valdemar Portney; Vasudevan Lakshminarayanan
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Paper Abstract

An understanding is required of the range of image quality reduction that can be tolerated by human subjects. The modulation transfer function (MTF) of the phakic eye provides a reasonable reference for nominal optical performance. We propose MTFs of a 1/4D and 1/2D defocused eye as minimum acceptability criteria. Weber's law can be used to assess whether differences from nominal values are likely to be detected. These criteria apply to assessment of distant object imaging. To predict levels of clinical measures based on in-vitro MTFs, a simple model of human threshold recognition/detection is discussed. This Expected Visual Outcome model provides a tool for estimating the clinical efficacy of a particular optical surface design.

Paper Details

Date Published: 26 May 1994
PDF: 10 pages
Proc. SPIE 2127, Ophthalmic Lens Design and Fabrication II, (26 May 1994); doi: 10.1117/12.176840
Show Author Affiliations
Alan J. Lang, Allergan Medical Optics (United States)
Valdemar Portney, Allergan Medical Optics (United States)
Vasudevan Lakshminarayanan, Univ. of Missouri/St Louis (United States)


Published in SPIE Proceedings Vol. 2127:
Ophthalmic Lens Design and Fabrication II
Donn Michael Silberman, Editor(s)

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