Measurements of contrast sensitivity by an adaptive optics visual simulator

作者：Yamaguchi Tatsuo^*; Ucikawa Keiji

来源：Optical Review, 2015, 22(4): 629-636.

DOI：10.1007/s10043-015-0100-y

• Adaptive optics visual simulator
• Contrast sensitivity
• Liquid crystal phase modulator

We developed an adaptive optics visual simulator (AOVS) to study the relationship between the contrast sensitivity and higher-order wavefront aberrations of human eyes. A desired synthetic aberration was virtually generated on a subject eye by the AOVS, and red laser light was used to measure the aberrations. The contrast sensitivity was measured in a psychophysical experiment using visual stimulus patterns provided by a large-contrast-range imaging system, which included two liquid crystal displays illuminated by red light emitting diodes from the backside. The diameter of the pupil was set to 4 mm by an artificial aperture, and the retinal illuminance of the stimulus image was controlled to 10 Td. Experiments conducted with four normal subjects revealed that their contrast sensitivity to a high-spatial-frequency vertical sinusoidal grating pattern was lower in the presence of a horizontal coma aberration than in the presence of a vertical coma or no aberrations (p < 0.02, Nagai method).

• 出版日期2015-8