| 摘要 |
The disclosure relates to a joystick (24) for positioning a test axis of an ophthalmic instrument relative to an eye of a patient. In a preferred embodiment, the joystick (24) includes an actuator (30) extending therefrom and arranged to alternately engage a pair of motor control switches (28a and 28b) incident to slight rotation of the joystick handle (31) in opposite directions, thereby activating a motor drive to raise and lower the test axis.
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