REFRAX MEASURING METHOD AND APPARATUS FOR MEASURING DEGREE OF EYE SIGHT ABNORMALITY, ESPECIALLY, ASTIGMIA

摘要

The invention concerns a process and device for measuring the degree of ametropia of an eye. The rays of a luminous source passes through a focussing lens and a test lens in order to create an image on the retina. The rays issuing from the source or from the image pass through a black optical slit and are reflected by at least one reflecting surface defined in a revolving screen driven in rotation by a motor. Application to refractometric instruments for measuring the degree of ametropia of the eye.