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Trial frame
TRIAL CASES, FRAMES AND REFRACTOR HEADS
trial frame
American Optical Company
North America: USA
20th c.
metal; celluloid
overall: 55 mm x 165 mm

Trial frame. White metal. Two-part short cylindrical browbar, adjustable for PD and nasal height via central screwthread wheel. Metal nose rest. Centre joints. Flexible flat-section sides, with spatula ends. Half-eye rims featuring single drop cell at front, with white celluloid protractor scale, and double drop cell behind.


2017.625

Transferred from the former Museum and Library of Optometry, Aston University / Gift of the family of the late Anthony G. Sabell FCOptom, 2016



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