| 摘要 |
An optical apparatus includes a viewer for viewing an object therethrough, a light receiving device for receiving a reflected light beam from an eyeball of an observer looking into the viewer, and a device for obtaining at least one optical constant of the eyeball from the electrical signal of the light receiving device, effecting correction during the calculation of the direction of the visual axis by the use of the optical constant, and producing a signal indicative of the direction of the visual axis.
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