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CSI Polycon - Vertex Distance Conversion
CONTACT LENSES AND ACCESSORIES
rule; slide rule
Syntex Ophthalmics Inc
North America: USA, Arizona, Phoenix
1980s
cardboard; plastic
overall: 212 mm x 80 mm

Contact lens measuring slide rule and fitting guide. Black, white and grey double-sided plastic outer wallet with laminated cardboard slide marked on one side with fitting values (powers) as read against vertex distance measurements in millimetres and, on the other side, a radius conversion table and also a thickness conversion table. Outer surface overprinted with a promotion for CSI Polycon brand contact lenses.


2017.743

Gift of Mr David Shannon MCOptom, 2017



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