Estimation of the clinical significance of changes to the optics of the eye

Alan J. Lang; Valdemar Portney; Vasudevan Lakshminarayanan

doi:10.1117/12.176840

26 May 1994 Estimation of the clinical significance of changes to the optics of the eye

Alan J. Lang, Valdemar Portney, Vasudevan Lakshminarayanan

Proceedings Volume 2127, Ophthalmic Lens Design and Fabrication II; (1994) https://doi.org/10.1117/12.176840
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

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.

Citation Download Citation

Alan J. Lang, Valdemar Portney, and Vasudevan Lakshminarayanan "Estimation of the clinical significance of changes to the optics of the eye", Proc. SPIE 2127, Ophthalmic Lens Design and Fabrication II, (26 May 1994); https://doi.org/10.1117/12.176840

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