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Optical Plastic Lens SEMI-FINISHED LENS

1.56 Flat Top Bifocal Lens

Material : 1.56 Index Resin (Ne=1.549, Abbe=38, Specific gravity=1.28)
Segment Placement : 5mm down -5mm in
Add Power : +1.00 to +4.00 in 0.25D steps.
Segment Size : 28mm

CONVEX SURFACE CONCAVE
SURFACE
     
Mominal
Curve
True
Curve
Sag
(sagitta:40mm)
Sag
(sagitta:50mm)
Radius Radius CT
(mm)
ET
(mm)
Dia
(mm)
1.549 1.530
4.25 4.18 4.04 1.51 2.37 131.29 132.50 8.7 11.7 75
6.25 6.25 6.03 2.27 3.57 87.87 88.80 11.3 8.8
Center Thickness:0.5mm Edge Thickness:0.5mm Diameter Ranges:0.5mm