| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for measuring the convergent accommodation to convergence (CA/C) ratio based on a fusional convergence by eliminating an adjustment response by the defocus of a retinal image being an adjustment stimulation and capturing an adjustment response purely by the fusional convergence. SOLUTION: A subject is allowed to perceive a stereoscopic presentation image by binocular parallax through the use of a three-dimensional display. Then an adjustment step response amount at that time is measured. An adjustment response amount by defocusing on a presentation surface with the stereoscopic image presented therein is subtracted from the measured value, so as to calculate an adjustment amount by the fusional convergence. The CA/C ratio is acquired based on the result. COPYRIGHT: (C)2005,JPO&NCIPI
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