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 |