Vertex Conversion

Only powers (+/-)4.00 or greater need to be vertexed. The following programs are based on a vertex distance of 13.00 millimeters.

Enter the spectacle lens power in the appropriate input box and hit the Calculate button to get the vertexed contact lens power. All powers must be entered in eigth of a diopter steps (4.00, 4.12, 4.37, 4.50, 4.62, 4.75, 4.87) up to +/-21.00.

Please be sure to use the decimal point (4.37).

Plus Powers

+
+

Minus Powers

-
-