NYMC Artifacts
Donor
Westchester Medical Society
Preview
Identifier
2015.1.6
Date Created
c. Late 1890's
Physical Dimensions
2"-by-6"
Description
This tool was used to measure refractive error, which occurs when the shape of the eye fails to bring light into focus on the retina, causing blurred vision. Once the error was measured, corrective lenses could be created.
