Yukio IIDA, Masahiro SHIBUTANI¹, Katsuhiko KOBAYASHI¹, Kazuhiko OHNUMA², Yoichi MIYAKE² and Toru NODA³

Graduate School of Science and Technology, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
¹Topcon R&D Center, Tokyo, 75-1 Hasunuma-cho, Itabashi-ku, Tokyo 174-8580, Japan
²Faculty of Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
³National Hospital Organization Tokyo Medical Center, 2-5-1 Higashigaoka, Meguro-ku, Tokyo 152-8902, Japan

(Received October 3, 2005; Accepted December 28, 2005)

The double-pass method is thought to obtain the point spread function (PSF) in human eyes based on two techniques: the symmetric double-pass method using the same pupil size and the asymmetric double-pass method using a different pupil size. The symmetric double-pass method provides autocorrelation of the retinal PSF and, thus, the modulation transfer function. The asymmetric double-pass method provides low-frequency partial-phase information and the partial phase-retrieval algorithm is applied to obtain the complete-phase information, and to estimate the PSF. The partial phase-retrieval algorithm is based on the iteration method proposed by Fineup and Kowalczyk and requires a lengthy computation. In this study, we propose a new high-speed phase-retrieval algorithm based on the property that the real and imaginary parts of optical transfer functions (OTFs) continuously change in value.

Key words: double-pass point spread function, phase-retrieval algorithm, human eye, one-dimensional simulation