An Optometer on a pillar stand

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An Optometer on a pillar stand. Wellcome Collection. Attribution 4.0 International (CC BY 4.0). Source: Wellcome Collection.

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An Optometer, an instrument for measuring the distance of distinct vision, on a pillar stand, with thirty-eight rotating lenses. These lenses would have been used to determine the strength of spectacles required by patients.

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