Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Folding
Patent
1977-06-24
1980-02-26
Evans, F. L.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Folding
33200, A61B 310
Patent
active
041903315
ABSTRACT:
An ophthalmic measuring instrument has an instrument frame with suitable clips for mounting the instrument frame to an eyeglass frame on the patient so that spaced eye viewing openings on the instrument frame of the ophthalmic measuring instrument are disposed in alignment with the position of the lenses for the given eyeglass frame to which the instrument frame is attached. The patient can view at a convenient reading distance any of a plurality of colored cards having white square targets of varying sizes thereon as a function of the working distance through adjustably connected transparent yellow and blue strips mounted on the instrument frame and movable relative to each other in front of said spaced eye viewing openings. By centering the instrument frame on the eyeglass frame, and monocularly occluding the patient's respective left eye and right eye, movement of first the yellow strip and then the blue strip, bisecting the patient's visual axes respectively for the left eye and the right eye will enable various measurements to be obtained, such as the exact inter-visual axes distance relative to the center of the eyeglass frames for near vision. The horizontally disposed blue strip can be provided with suitable bracket means for receiving a corrective lens where a patient has a refractive error or presbyopia.
Additionally, the instrument has an angle measuring device which includes, an elongated tube adjustably movable in a vertical arc and a horizontal arc to provide the inclination angle and vergence angle of the visual axis for each respective eye of the patient when the target is viewed.
REFERENCES:
The Optometric Weekly, Sep. 28, 1961, pp. 1908-1910, Author: Otto Engelmann.
Padula, I William V.
Padula, II William V.
Bobis Daniel H.
Bovernick Rodney B.
Evans F. L.
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