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26 May 1994 Estimation of the clinical significance of changes to the optics of the eye
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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.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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);

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