50.0 MB (3.3 MB compressed)
5194 x 3364 pixels
43.9 x 28.4 cm ⏐ 17.3 x 11.2 in (300dpi)
SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Wollaston type optometer dating from 1860, England. 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 is made from boxwood and brass.
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