| 摘要 |
PROBLEM TO BE SOLVED: To automatically perform an accurate operation distance adjustment by constituting a control means in such a manner that a first driving means is drive- controlled so that a reflecting image may be image-formed on an image receiving means based on the image-forming state of a reflefting image which is received by the image receiving means. SOLUTION: An alignment while observing an anterior segment is performed by moving an mirror body 3 in the XY direction in such a manner that a reflecting ray from the surface F of a bulb of eye of an alignment index ray which is projected to the surface F of the bulb of eye from the front surface may enter a specified range on the image receiving screen of a television camera 10 while receiving the image of the anterior eye area of a subject eye E by the television camera 10 of an anterior eye area observing optical system Sa2, and is performed by transmitting a driving signal to an XY axis driving mechanism 52 when an XY control circuit 53 receives an image signal from the television camera 10. Also, an operation distance adjustment by an operation distance index which is projected from a diagonal direction to the subject eye E is performed by moving the mirror body 3 in the Z direction by an operation distance index projecting optical system Sb, and transmitting a drive-control signal to a Z axis driving mechanism 51.
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