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G Takeuchi, K Kobayashi, K Ohnuma, Y Miyake, K Negishi, N Hirayama, K Ohno, T Noda; Comparison of Single-Pass MTF Using a New Point Spread Function Analysis System with MTF Obtained by Raytracing of Lens Data in the Same Human Eye . Invest. Ophthalmol. Vis. Sci. 2002;43(13):2026.
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Purpose:To evaluate the single-pass modulation transfer function (MTF) deduced from the double-pass point spread function (PSF) using a new point spread function analysis system (PSFAS). Methods:We compared the single-pass MTF deduced from the double-pass PSF using PSFAS with the MTF calculated from lens data from the same subject using raytracing lens design software (Light Tools) in a pseudophakic eye. The double-pass PSF was obtained using PSFAS where a specular reflection double-pass method was used. After calculating the Fourier transform of the double-pass PSF image, we calculated the square root of the modulus to obtain the single-pass MTF. The lens data were obtained from the same eye. The anterior and the posterior cornea curvature were measured by Orbscan (Orbtech), the anterior chamber depth and the axial length were obtained by IOL Master (Zeiss). The lens data from the implanted IOL (Alcon) and other necessary index data from the schematic eye were used for the raytracing calculation. The Stiles-Crawford effect was added or not added to the raytracing to calculate the MTF. Results:The MTF by PSFAS approximately agree with the MTF by raytracing with the Stiles-Crawford effect, rather than the MTF by raytracing without the Stiles-Crawford effect. Conclusion:The result indicated that the single-pass MTF deduced from the double-pass PSF by PSFAS agreed with the eye’s optical characteristics inclusive of the Stiles-Crawford effect.
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