| 摘要 |
PURPOSE:To accurately and effectively perform laser radiation and leave a treatment record by providing an optical system guiding a treatment laser beam and optical elements coaxial with a photograph optical system and an observation optical system. CONSTITUTION:When a lever is operated, a variate lens 30 and a compensator lens 29 are moved at the preset relation in response to the preset spot diameter. When a parfocal optical system is employed, the position of the image on a fiber end face due to an image forming lens 32 is not moved. A subject observes the fundus images of test eyes on focusing screens 25a, 25b via an eyepiece 26. When the fundus image becomes out of focus due to the refracting power of the test eye, focusing lenses 19a, 19b are moved so that the focal point is matched with the fundus. A laser delivery optical unit is moved interlockingly with the movement of the focusing lenses 19a, 19b, the plane (plane D) on which the image of the fiber end face is formed is moved in the optical axis direction, and it is located at the position conjugate to the fundus. |
