Antique Auction

A rare antique American application for Johnston Optometer. Patented 1882. A machine for optometrist lens graduation tester. Johnston optometer was used to measure a persons refractive error, strength of eye glasses needed. This was determined by having the person view an object through the eyepiece then rotating the dials until the object was most clear. The main problem was that the natural ability of the eye to focus could throw off the result. Antique Patented Measuring Instruments and Devices For Collectors.

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