| 摘要 |
Behind of the front objective, in the region of both parallel axes of the beams of rays of the microscope is disposed a slewable optical prismatic body with two plane parallel front faces and two opposite inclined, parallel refractive pairs of faces. In a basis position of this prismatic body, the path of the axes of the beams of rays remains uninfluenced by the plane parallel front faces of the optical prismatic body. In a position of the optical body pivoted by 90 DEG , the beams of rays pass through the inclined refractive faces and they experience a transverse displacement. In accordance with the position of the prismatic body one may obtain therefore a greater or smaller stereoscopic angle alpha . This leads to significantly improved viewing possibilities, more particularly for eye examination. |
