71m/m Upper & Lower Rd. 22m/m Bi-focals

Occupational 14m/m Separation

 

Semi-Finished:

Material: CR-39*                            Note

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

 

Additions:

            1.00      1.25      1.50      1.75      2.00      2.25

            1.00      1.25      1.50      1.75      2.00      2.25

 

2.50      2.75      3.00      3.25      3.50      3.75

2.50      2.75      3.00      3.25      3.50      3.75

 

Higher additions available

 

10.25 Base available in 71m/m only

 

Additions also available in .50 diopters less on top

 

 

 

Material: CR-39*  Plastic                                                                        Specific Gravity: 1.32

Index of Refraction: 1.498                                                                       Occupational Round

Abbe Value: 58                                                                                 22m/m, 25m/m & 28m/m
                                                                                                      
65m/m & 71 m/m Blanks

 

                             Upper & Lower • Rd. 22, 25, 28m/m Bi-focals

                                                   14m/m Separation

 


Lens                 Actual    Nominal    Actual          Back        Sag                                               Seg                Seg

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

 


22/25/28         65m/m    Plano          0.00              2.25          0.00        12.3          14.3              4.0            7.0

22/25/28         65m/m       2.00          2.00              2.25        1.191        10.8          11.4              4.0            7.0

22/25/28         65m/m       4.25          4.25              6.25        2.573          9.4          10.4              4.0            7.0

22/25/28         65m/m       6.25          6.25              6.25        3.864          8.0            7.4              4.0            7.0

22/25/28         65m/m       8.25          8.25              6.25        5.240        10.5            7.8              4.0            7.0

22/25/28         65m/m    10.25        10.25              6.25        6.742        12.5            7.0              4.0            7.0

22/25/28         65m/m    12.00        12.00              6.25        8.207        15.4            7.2              4.0            7.0

22/25/28         71m/m       2.00          2.00              2.25        1.191        11.2          11.5              4.0            7.0

22/25/28         71 m/m      4.25          4.25              6.25        2.573          9.0          10.4              4.0            7.0

22/25/28         71 m/m      6.25          6.25              6.25        3.864          8.2            7.4              4.0            7.0

22/25/28         71 m/m      8.25          8.25              6.25        5.240        10.8            7.4              4.0            7.0

22/25/28         71 m/m   10.25        10.25              6.25