Refractometry process and device for measuring the degree of ame

Details Refractometry process and device for measuring the degree of ame Refractometry process and device for measuring the degree of ame

1984-05-16

1986-10-28

Bovernick, Rodney B.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351205, A61B 310

Patent

active

046195050

ABSTRACT:
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.

REFERENCES:
patent: 3791719 (1974-02-01), Kratzer et al.

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