Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – For fusion and space perception testing
Patent
1980-08-11
1983-07-26
Rosenberger, R. A.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
For fusion and space perception testing
351237, 351211, A61B 302
Patent
active
043950973
ABSTRACT:
A compact refraction instrument for use in both the objective and subjective examination of human eyes. The instrument incorporates an alignment mode, a retinoscopy mode, a distance mode and near mode. For carrying out the functions associated with these modes, the instrument includes a Brewster stereoscope and a system for supporting a plurality of binocular/monocular vision testing slides. Positioned along the pair of optical paths between the Brewster stereoscope and the slide supporting system are: a first mask/septum system; a mode change system; a second mask/septum system; and a horizontal/vertical target mask system. The instrument also includes a refractor system and apparatus for suspending the refractor system in the optical paths before the Brewster stereoscope. The slide supporting system includes two rotatable concentric drums. The mode change system includes a first mirror for folding the optical paths when the instrument is used for subjective testing at a distance and near vision testing. Alternately, for retinoscopic examination, the paths are folded by a pair of mirrors having an opening therebetween. The Brewster stereoscope and both septums are rotatable so that they can be inserted into or removed from the optical paths as required by the various modes of operation of the instrument.
REFERENCES:
patent: 2364793 (1944-12-01), Jobe et al.
patent: 3874774 (1975-04-01), Humphrey
patent: 3891311 (1975-06-01), Fletcher et al.
patent: 3927933 (1975-12-01), Humphrey
Bausch & Lomb Incorporated
Bogdon B. D.
Morgan D. M.
Rosenberger R. A.
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