X-Pro Omnis Transitions Gray/Brown 1.50 Basecurve Selection Table

Blank Lens

Base

True Base

Radius

Centre

Edge

50 mm

Blank Size: 75 mm  Basecurve 3.00, 4.00, 5.00  Blank Size: 70 mm  Basecurve 7.00

Diameters

Curve

Index 1.53

(mm)

Thickness

Thickness

SAG

Add Powers: 1.00 to 3.50 in 0.25 Dioptre Steps

75

3.00

3.00

176.600

10.0

14.0

1.78

Material Properties: Refractive Index 1.497   Abbe Value 55   Density 1.27

75

4.00

4.28

123.880

10.0

12.0

2.55

Lens Engraving: TG

75

5.00

5.75

92.220

8.0

8.0

3.45

Engraving Code

10

12

15

17

20

22

25

27

30

32

35

70

7.00

7.32

72.380

10.0

8.0

4.45

Addition Power

1.00

1.25

1.50

1.75

2.00

2.25

2.50

2.75

3.00

3.25

3.50