| 摘要 |
In a noncontact ophthalmotonometer: an image processing operation is performed on an image signal subjected to an imaging operation to extract a pupil, to compute location of the center of gravity thereof, and to move a measuring mechanism so that the center of gravity is located at the central axis of a nozzle. Locations of two alignment mark images from the signal are detected to compute distance from a nozzle end to a cornea from a gap between centers of gravity of the mark images. When the nozzle end approaches the cornea, the mechanism moves away therefrom. The mechanism moves toward an eye in the direction of the nozzle central axis to detect a second mark image. An aligning operation is performed using the second mark image. Eye pressure is then measured. The mechanism moves to a location farthest from the eye in the direction of the nozzle central axis.
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