| 摘要 |
A deflector, through which a subject views a target or visual stimulus, can independently move the visual stimulus horizontally and vertically to stimulate or compensate the subject's eye movement and can alter the optical distance to stimulate or compensate accommodation (focus). The target is projected on the subject's eye by way of two mirrors serially disposed in the projecting path and mounted for rotation about vertical and horizontal axes, respectively. Lens elements produce an undistorted unity magnification image of the eye at each mirror, with the center or rotation of the eye in each image nominally on the axis of rotation of the respective mirrors, and servo motors independently rotate the mirrors about their respective axes to produce vertical and/or horizontal deflection of the stimulus at the eye. The deflection mirror closest to the target is moved axially along the projected path, together with one of its imaging lens elements and the projected target or target image, to adjust spherical power and thereby stimulate or compensate accommodation.
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