Evaluation of point spread function of the peripheral visual field in human eye

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We evaluated the peripheral retinal image quality in relation to phakic and pseudophakic eyes. It has been widely assumed that the human crystalline lens exists solely for accommodation, but this assumption has not fully been tested in a manner that takes account of peripheral optics, i.e., the defocus component and higher-order aberrations. The difference in relative peripheral defocus seems to be even larger in eyes with artificial IOLs than with crystalline lenses. We compared the best off-axis PSFs of human lenses with those of artificial IOLs, and our results suggest the importance and a heretofore unrevealed physiological role of the human lens; namely, the human lens acts as a buffer to protect against blurring in the peripheral vision in terms of defocus and aberration.