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T. Noda, K. Fujiike, K. Ohno, K. Negishi, K. Ohnuma; Evaluation of Visual Function in Eyes With Cataract Using a Point Spread Function Analyzer. Invest. Ophthalmol. Vis. Sci. 2007;48(13):1577.
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© ARVO (1962-2015); The Authors (2016-present)
To evaluate visual function in eyes with a cataract using a point spread function (PSF) analyzer.
Double-pass PSF images were analyzed using a PSF analyzer (Topcon, Tokyo) in 44 eyes with a cataract. Retinal images were simulated by convolution of the calculated single-pass PSFs using a variety of sizes of Landolt rings. The vision was estimated based on the contrast analysis of the simulated Landolt rings and compared with the subjective best-corrected visual acuity (BCVA) values. Modulation transfer functions of the optical systems were obtained through equal-sized apertures (the entrance and exit pupils), and the phase transfer functions were obtained through unequal-sized apertures. The simulated retinal images were reconstructed with and without a phase-retrieval algorithm.
No significant correlation between the subjective BCVAs and the estimated visual acuity by PSF analysis based on the unequal-pupil method with the phase-retrieval algorithm was seen; vision estimation correlated better with the equal-pupil method without the phase-retrieval algorithm in cataractous eyes.
Evaluation of the visual function in eyes with a cataract is difficult using the double-pass method through unequal-sized apertures with the phase-retrieval algorithm. Better visual estimates were obtained without the phase-retrieval algorithm in cataractous eyes.
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