| 摘要 |
1,198,174. Laser ophthalmoscopes. SOC DES LUNETIERS. Feb. 29, 1968 [March 10, 1967], No. 9956/68. Heading G2J. In a portable photo-coagulator consisting of a laser 54 and an ophthalmoscope housed in a common tube 52, the laser and optical head of the ophthalmoscope are centered relative to each other by a projection 62 of the head engaging a cavity (61) Fig. 9, (not shown) in a journal 59 supporting the laser 54, and the laser is centered in the tube 52 by means of two journals 58, 59 and a flange 60 which is held against the tube by a screw cap 56. The laser is removed when it has aged and a new one substituted. A physician sets lens 15 on two recoss discs 12, 13 to correct for the patients' ametropia. Light from a lamp 1a is transmitted through a test mark (31) Fig. 1 (not shown) via prism 5, mirror 6, adjustable lens 7, and lens 16 of the disc 12 into the patients eye. The lens 7 is adjusted by rotating a knob 37 so as to focus an image of the test mark on the patient's retina, forming a conjungate image at a point (32) (Fig. 1) adjacent the lens 7. By means of an adjustment knob 74, the laser divergence is varied to obtain the desired impact diameter of the laser beam. The energy density is determined from tables and the level set by means of an attenuator (48) (Fig. 1). Having adjusted the photo-coagulator, the physician trips a valve 39 to uncover a control member (42) Fig. 7 (not shown) which he then depresses. This causes a blade 45 to block the physician's field of vision 51 and fires the laser, the beam passing through the hole in the mirror 6. The field of vision 51 is uncovered when the physician removes his finger from the valve 39 and control member (42). |
