50.0 MB (3.0 MB compressed)
4168 x 4192 pixels
35.3 x 35.6 cm ⏐ 13.9 x 14.0 in (300dpi)
SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Front view of an optometer. An optometer is a device used to assess the range and power of vision. The earliest reference to optometry was by English friar, Roger Bacon (1214-1292) who in 1263 described the use of lenses for those with weak eyes. By the 1900s optometry had become an established profession. This device dates from 1900, England.
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