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D. Compertore, A. Kingston, I. Cox; Area Under the Modular Transfer Function Curve Does Not Predict Convolved E Image Quality. Invest. Ophthalmol. Vis. Sci. 2009;50(13):1554.
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The purpose of this analysis was to examine and relate the area under the curve modular transfer function (MTF) values and convolved E image quality for a set of intraocular lens designs.
A series of intraocular lens (IOL) designs representing single vision spherical and aspheric lenses were modeled in ZemaxTM. The ZemaxTM model consisted of a 43 D paraxial cornea and the IOL. The intraocular lens designs all used commonly used optical surfaces that could be lathed or molded using current technology. A set of area under the curve MTF values were recorded for different object positions, and related to convolved single letter images representing a 20/20 Snellen letter. Observers subjectively ranked the convolved E’s on a scale of 1 to 3 with 1 being best image quality.
Image quality for the convolved E’s differed noticeably for the series of test designs. The conventional assumption is that a larger area under the curve MTF value indicates better image quality. However, in this standard set of 3 intraocular lenses better E’s as ranked by 3 observers were associated with lower area under the curve MTF values 42% of the times.
Area under the MTF curve alone is not an absolute predictor of image quality.
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