50.0 MB (3.2 MB compressed)
5187 x 3369 pixels
43.9 x 28.4 cm ⏐ 17.3 x 11.2 in (300dpi)
SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Set of horn and glass trial lenses. These were used for eye testing. 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. These are English and date from around 1870.
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