| 摘要 |
A noncontact ophthalmotonometer carries out the following first to sixth steps to measure eye pressure. The first step is to perform an image processing operation on an image signal that has been subjected to an imaging operation in order to extract a pupil, to compute the location of the center of gravity thereof, and to move a measuring mechanism so that the center of gravity is at the location of the central axis of a nozzle. The second step is to detect the locations of a pair of alignment mark images from the image signal in order to compute the distance from an end of the nozzle to a cornea from a gap between the centers of gravity of the first alignment mark images. When the end of the nozzle approaches the cornea, the measuring mechanism is moved away from the cornea. The third step is to move the measuring mechanism toward an eye to be examined in the direction of the central axis of the nozzle in order to detect a second mark image produced by a second alignment mark light source. The fourth step is to perform a precise aligning operation using the second mark image. When the aligning operation is completed, the fifth step is carried out to measure eye pressure. The sixth step is to move the measuring mechanism to a location farthest from the eye to be examined in the direction of the central axis of the nozzle.
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