| 摘要 |
An optometric apparatus ( 2 ) includes a rotary prism ( 136 a, 136 b) disposed in front of the eye (E), for adding a prism degree to the eye (E); a rotation device including a pulse motor ( 181, 184 ) and a rotation transmitting mechanism ( 146, 147, 176, 176 a , 177, 177 a , 178, 179, 182, 183, 185, 186 ) for transmitting rotation of the pulse motor to the rotary prism, the rotation device being adapted for rotating the rotary prism to change the prism degree; a command device ( 43 a, 43 b) for generating a command signal to start and stop the rotation of the rotary prism; and a control unit ( 60 ) for controlling the rotation device to drive the pulse motor to rotate at a speed of 5 pulses/sec. or more when the control unit receives the rotation start command signal until when receives the rotation stop command signal, and, to change the prism degree at a speed of 0.1 to 1.0 prism/sec.
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