Procedure and device for automatic refractometric measurement of

Details Procedure and device for automatic refractometric measurement of Procedure and device for automatic refractometric measurement of

1986-09-05

1987-06-16

Bovernick, Rodney B.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351205, 351211, A61B 310

Patent

active

046732659

ABSTRACT:
This invention concerns a procedure and device for refractometric measurement of the degree of ametropia of a human eye.
The device for this invention comprises a light-emitting source combined with a focusing lens, which produces an image of this source on the retina of the eye to be tested, a succession of test lenses which are placed in turn between the eye and the focussing lens, so that the optical axis of the relevant test lens coincides with the optical axis of the eye, and a light-intensity detector placed on this same axis at a fixed distance from the eye, together with means of identifying which test lens causes the detector to emit a signal of minimum intensity.
The invention applies to instruments to measure visual acuity, more specifically in handicapped or very young patients.

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

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