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DuraSoft Optifit Toric - Vertex Distance Conversion
CONTACT LENSES AND ACCESSORIES
rule; slide rule
Wesley-Jessen Inc
North America: USA
December 1996
cardboard
overall: 218 mm x 79 mm
2017.742
CONTACT LENSES AND ACCESSORIES
rule; slide rule
Wesley-Jessen Inc
North America: USA
December 1996
cardboard
overall: 218 mm x 79 mm
Contact lens measuring slide rule and fitting guide. Blue, green and white double-sided 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. Outer surface overprinted with a promotion for DuraSoft OptiFit Toric brand contact lenses.
2017.742
Gift of Mr David Shannon MCOptom, 2017