Gelflex Contact Lens Calculator and Radius Conversion Table

Catalogue Number: 3985
Gelflex Contact Lens Calculator and Radius Conversion Table
Category: Equipment
Sub-Category: Contact lens equipment
Corporation: Gelflex Laboratories
Year Of Publication/Manufacture: 1990s
Time Period: 1940 to 1999
Place Of Publication/Manufacture: Perth, Western Australia
Publisher/Manufacturer: Gelflex Laboratories
Description Of Item: Light card sleeve with internal slide. Face is the Contact Lens Calculator which has a narrow window displaying spectacle Rx and conversions for both plus and minus power, to allow for vertex distances from 7 to 15 mm in mm steps. A Gelflex logo and contact information are at the foot of the sleeve. Reverse is the Radius Conversion Table with four small windows displaying Lens Curve and Concave Lens Surface Readings in Dioptres and Millimetres.
Historical Significance: A tool to assist in selection with calculation of appropriate lens powers and conversion of keratometer readings to millimetres of curvature
How Acquired: Donated by Colin Bates
Date Acquired: 17/7/2017
Condition: Good
Location: Archive office. Pamphlet and ephemera filing cabinet. Drawer 10

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