Patient's head securing control for ophthalmic diagnosis - has appts. with photocell, while light beam generator for photocell illumination is secured to patient's head

摘要

The appts measures or diagnoses eye muscle lesions or squint. A patient's head securing control. The diagnostic appts. (10) has a photocell (34), while a light beam (32) generator (30), directing the beam onto the photocell, is firmly secured to the patient's head. If the light beam does not impinge on the photocell, the appts. current circuit is broken. A light source is pref. used as the beam generator, and a collector lens may be set in front of it for the beam focussing. Alternately a mirror may be secured to the patient's head and the light source secured at the appts. ADVANTAGE - No faulty measuring results caused by patient's head movement.