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CONTACT LENSES AND ACCESSORIES
rule; slide rule
Essilor; Lunelle Soft Contact Lenses
Europe: United Kingdom
1980s
cardboard; plastic
overall: 207 mm x 56 mm
Contact lens measuring slide rule and fitting guide. Light and dark blue double-sided plastic outer wallet with white laminated cardboard slide marked on one side with fitting values (powers) as read against a vertex distance measurement of 12 millimetres compared with the relevant spectacle Rx, plus a millimetre rule along one edge and, on the other side, a radius conversion table read against the flattest K cornea and also a size gauge. Outer surface overprinted with a promotion for Lunelle brand soft contact lenses.
2017.744
Gift of Mr David Shannon MCOptom, 2017