TY - JOUR
T1 - Simulated retinal images of Landolt rings in human eyes including asymmetric aberrations on the point spread function analysis system
AU - Shibutani, Masahiro
AU - Kobayashi, Katsuhiko
AU - Takeuchi, Gaku
AU - Kubotera, Yumi
AU - Ohnuma, Kazuhiko
AU - Negishi, Kazuno
AU - Ohno, Kenji
AU - Noda, Tom
N1 - Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2004
Y1 - 2004
N2 - We newly developed a Point Spread Function Analysis System (PSFAS) to study the optical system of the human eye. In this system, an infrared point light source is projected onto the subject's eye and the reflected image at the retina is captured by the charge coupled device (CCD) (i.e., double-pass formula). The single-pass modulation transfer function (MTF) is calculated from the captured image with equal sized apertures of the entrance and exit pupils, and the phase transfer function (PTF) is calculated from the captured image with unequal sized apertures of them. The optical transfer function (OTF) is deduced from this MTF and PTF, then retinal images can be simulated with both this OTF and the original charts. The smaller aperture of the incident ray is determined so as to give a diffraction limit, then the simulated retinal images include the information of asymmetric aberrations. The simulated retinal images of the Landolt's rings were compared with subjective sensations in the same subject with keratoconus. The PSFAS can objectively evaluate the characteristics of the human optical system and therefore is very useful in an ophthalmology clinic setting.
AB - We newly developed a Point Spread Function Analysis System (PSFAS) to study the optical system of the human eye. In this system, an infrared point light source is projected onto the subject's eye and the reflected image at the retina is captured by the charge coupled device (CCD) (i.e., double-pass formula). The single-pass modulation transfer function (MTF) is calculated from the captured image with equal sized apertures of the entrance and exit pupils, and the phase transfer function (PTF) is calculated from the captured image with unequal sized apertures of them. The optical transfer function (OTF) is deduced from this MTF and PTF, then retinal images can be simulated with both this OTF and the original charts. The smaller aperture of the incident ray is determined so as to give a diffraction limit, then the simulated retinal images include the information of asymmetric aberrations. The simulated retinal images of the Landolt's rings were compared with subjective sensations in the same subject with keratoconus. The PSFAS can objectively evaluate the characteristics of the human optical system and therefore is very useful in an ophthalmology clinic setting.
KW - Asymmetric aberrations
KW - Convolution
KW - MTF
KW - OTF
KW - Ophthalmology clinic setting
KW - PTF
KW - Point Spread Function
KW - Simulated retinal image
KW - Visual function
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U2 - 10.1117/12.527931
DO - 10.1117/12.527931
M3 - Conference article
AN - SCOPUS:12144255900
VL - 5
SP - 229
EP - 236
JO - Progress in Biomedical Optics and Imaging - Proceedings of SPIE
JF - Progress in Biomedical Optics and Imaging - Proceedings of SPIE
SN - 1605-7422
IS - 3
M1 - 5314-42
T2 - Ophthalmic Technologies XIV
Y2 - 24 January 2004 through 27 January 2004
ER -