Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1997-04-03
1998-11-17
Mai, Huy
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351221, 351245, A61B 310
Patent
active
058384219
ABSTRACT:
A portable, binocular direct ophthalmoscope. A frame carrying a binocular optical system is suspended for rotation about a pivot axis from one end of a support beam; an opposite end of the support beam is attached to a handle. A beam splitter block mounted to the frame carries an illumination source for light emission along an illumination axis and into an eye of a subject. Left and right beam splitting mirrors attached to the block are symmetrically and obliquely disposed on opposite sides of the illumination axis. Light reflected back from the subject's eye is split by the beam splitting mirrors into a left-directed beam and a right-directed beam, which are each reflected rearward by laterally spaced apart deflection mirrors through left and right dioptric disk assemblies and thence into the left and right eyes of an observer, respectively. This arrangement permits positioning the light source and the beam splitting mirrors all within a circle normal to the illumination axis of diameter no more than 6 to 7 mm, thereby achieving a stereoscopic image. In a first embodiment of the invention, the dioptric disk assemblies are attached to mounts that slide within a C-channel attached to the frame for adjustment to the interpupillary distance of the observer. In a second embodiment, worm gear assemblies interconnected by a telescopic coupling rotate dioptric disks when attached lens power knobs are turned. In a third embodiment, a pair of laterally adjustable dioptric disks are provided with radial teeth that engage the teeth of an idler gear.
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Coyne Brian J.
Mai Huy
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