71 m/m Blended - - - Rd. 22m/m---Rd. 25m/m---Rd. 28m/m

 

Semi-Finished:

Material: CR-39*

 

Base Curves: 2.00, 4.25, 6.25, 8.25, 10.25

 

Additions: .50, .75, 1.00, 1.25, 1.50, 1.75, 2.00, 2.25, 2.50, 2.75, 3.00, 3.25

                       

(3.50 thru 10.00 in .50 steps)

 

Blended as much as physically possible

 

Higher Additions also available

 

 

Material: CR-39* Plastic                                                                      Specific Gravity: 1.32

Index of Refraction: 1.498                                                    Blended Round 25m/m Bi-focal

Abbe Value: 58                                                                                            71 m/m Blanks

 


Lens         Actual        Nominal      Actual            Back           Sag                                                Seg        Seg

Style         Size                  Curve       Curve           Curve     50m/m        C.T.           E.T.           Inset        Drop

Rd.-25      71m/m               2.00          2.00              2.25        1.191        11.2          11.5              0.0        4.5

Rd.-25      71 m/m              4.25          4.25              6.25        2.573          9.0          11.5              0.0        4.5

Rd.-25      71 m/m              6.25          6.25              6.25        3.864          8.2          11.5              0.0        4.5

Rd.-25      71 m/m              8.25          8.25              6.25        5.240        10.8          11.5              0.0        4.5

Rd.-25      71 m/m           10.25        10.25              6.25                *              *                *                  *        *

 

Note: **Information Not Available at Press Time.