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Tolerance levels for Ophthalmic lenses

 

Spherical powers of each principal meridian

± 0.12 D for powers between ≤ ±6.0 D
± 0.18 D for powers > 6.0 D and ≤ 10.D
± 0.25 D for powers > 10.0 D and ≤ 15.0 D
± 0.37 D for powers > 15.0 D and ≤ 20.0 D
± 0.5 D for powers >20.0 D

Prism tolerance

Up to ± 3.0 =0.25 vertical
>3.0 - 10 % of the power e.g. ± 10.0 = 1.0 ok
Up to  ± 5.0 0.5 Horizontal
>5.0 -  10 % of the power e.g. ± 10.0 = 1.0 ok

Cylindrical Power

± 0.12 D for cyl powers ≥  -0.75 D
± 0.18 D for cyl powers < -0.75 D and ≥ -4.0.D
± 0.25 D for cyl powers < -4.0 D and ≥ -8.0 D
± 0.37 D for cyl powers < -8.0 D and ≥ -12.0 D
± 0.5 D for cylindrical powers < -12.0 D

Tolerance for mounted lenses Bifo /Prog

1 mm vertical difference between right and left.
1 mm difference in height compared to order.
1 mm / side horizontal difference.

Cylinder Axis

Up to cyl. - 0.75 ± 6 degrees
Up to cyl. - 1.5 ± 4 degrees
Up to cyl. - 2.5 ± 3 degrees
Over cyl. 2.5 – ± 2 degrees

Tolerance addition Bifo/Prog (not Optio)

± 0.12 D for addition ≤ 4.0 D
± 0.18 D for addition > 4.0 D