Catalogue Number: 3467
Permalens Promotional PD (Pupillary Distance) and Visible Iris Diameter Rule
Sub-Category: PD ruler, pupillometer
Year Of Publication/Manufacture: c1990
Time Period: 1940 to 1999
Place Of Publication/Manufacture: U.S.A.
Description Of Item: Flexible white plastic rule 186 mm x 35 mm with scale in centimetres with millimetre graduations on both edges, a dioptre to radius of curvature conversion table and Permalens Soft Contact Lenses printed on one face. A Visible Iris Diameter interval scale from 9.0 mm to 13.0 mm in 0.5 mm steps and Permalens oxygen permeable soft contact lenses for extended wear on the opposite face.
Historical Significance: Permalens soft contact lenses were manufactured by Coopervision and one of the first contact lenses to be approved by the US Food and Drug Administration (FDA) for extended wear.
How Acquired: Donated by Colin Bates
Date Acquired: 5-6-2017
Location: Archive room. West wall. Unit 6 Drawer 2