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Prototype Near Vision Unit
OPTOMETRIC INSTRUMENTS
near vision test
20th c.
wood
1999.3970
OPTOMETRIC INSTRUMENTS
near vision test
20th c.
wood
Near Vision testing instrument (prototype) consisting of a wooden head on an electrically-insulated handle with flex running through it. Three white plastic push switches. Aperture through which is viewed a twin test type card behind a slide containing various filters.
1999.3970