| 摘要 |
PROBLEM TO BE SOLVED: To test the visual field without causing an aperture eclipse by arranging a beam splitter at a certain angle to a Littrow reflector to form an optical relay system, and relaying a point within the incident pupil plane or a point conjugated thereto. SOLUTION: A beam splitter 130 is set to a comfortable angle for a subject, or example, about 45 deg. to a Littrow reflector 140. The size of the Littrow reflector 140 is determined depending on the displacement of the incident light quantity allowable in design, but must be small-sized. The beams 110 and 120 emitting from a point 100 of the incident pupil plane are collided to the beam splitter 130 and partially reflected in the direction of the Littrow reflector 140. The reflected beam is passed through the beam splitter 130 and converged to the point 150 of the image of the point 100 within the pupil plane. According to this, a 1:1 optical relay system having no optical convergence can be provided, and the visual field of a patient can be examined.
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