Signet SRC - Trifocal 7x28
(Standard Index 1.498)
70mm Diameter Lens Blank
Segment Displacement: 5mm in, 1mm down
Adds are in 0.25 diopter steps from 1.50 to 3.00
Intermediate range is 50%
Nominal Curve True Curve Radius mm SAG at 50mm Nominal Concave Edge Thickness Center Thickness

2.00

2.01

263.682

1.19

6.75

14.5

8.8

4.25

4.14

128.019

2.46

6.75

11.0

8.0

6.25

6.26

84.665

3.78

6.75

11.0

10.3

8.25

8.41

63.02

5.17

6.75

7.5

10.3

10.25

10.59

50.047

6.69

6.75

8.0

13.7