Dual optometer

Dual optometer

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Caption: Dual optometer used for sight testing. This instrument was made by Nathanial Davidson in 1893.

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Keywords: 1800s, 19th century, antique, diagnosis, diagnostic, disc, discs, dual optometer, equipment, eye test, eyes, historical, history, instrument, nathanial davidson, ophthalmology, ophthamological, opthalmology, opthamological, optometry, sight test, technological, technology, testing

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