Measurement of Wavefront Aberration of Human Eye Using Talbot Image of Two-Dimensional Grating |
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Authors: | Ryotaro Sekine Takashi Shibuya Kazuhiko Ukai Shinichi Komatsu Masayuki Hattori Toshifumi Mihashi Naoki Nakazawa Yoko Hirohara |
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Institution: | (1) Department of Applied Physics, School of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan;(2) Material Research Laboratory for Bioscience and Photonics, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan;(3) Topcon Corporation, 75-1 Hasunuma-cho, Itabashi-ku, Tokyo 174-8580, Japan |
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Abstract: | The measurement of human ocular aberration is now frequently performed because of the increase in refractive surgery on the
human cornea. The Hartmann-Shack (H-S) wavefront sensor is considered to be the most useful wavefront sensor, and a calculation
method for wavefront aberration has been established. New methods of measuring wavefront aberrations of human eyes, using
the Talbot image of a two-dimensional grating as a wavefront sensor and local shift of the Talbot image to calculate tilt
of the wavefront are shown. The shift of the Talbot image was determined by comparing the phases of fundamental spatial frequency
between the grating and the local patch of the Talbot image by Fourier transformation. The actual experiment was performed
using a modified commercially available wavefront analyzer. Using these methods, Talbot images were obtained from model eyes
and a human eye, and wavefront shapes were successfully reconstructed. Wavefront aberrations can be measured even when the
obtained image is degraded by defocusing or scattering. |
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Keywords: | Talbot image wavefront sensor human eye wavefront aberration two-dimensional grating Fourier analysis |
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