| 摘要 |
PURPOSE:To easily execute the alignment by a simple constitution by providing an observation optical system for observing an anterior eyeball part of a patient' s eye, and a projection optical system for projecting a slit to the patient's eye from at least two directions by putting an optical axis of an objective lens of the observation optical system in-between. CONSTITUTION:The greater part of a slit light from a slit projection optical system 12a of the left side passes through the cornea 11, but a part thereof is scattered by the cornea 11 and observed as a circular arc-like slit line 17a through a microscope 10. On the other hand, a slit light from a slit projection optical system 12b of the right side is also observed as a slit line 17b in the same way. In this case, when the apex of the cornea 11 is in a focal position of the microscope 10, the slit lines 17a, 17b are superposed in a position of the cornea apex. Accordingly, by adjusting a distance between the device and the cornea 11 so that the slit lines 17a, 17b are superposed in a position of the cornea apex, a focus of the microscope 10 can be adjusted onto the cornea 11. |
