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Slab-Off Calculator
Does your patient require a slab-off lens?
Use our handy slab-off calculator to help determine if a slab-off is required for a patients prescription.
Enter sphere and cylinder values with decimal points.
Sphere
Cylinder
Axis
Right:
FT 28
7x28
Left:
O.C.
Result:
diopters of prism
Results are rounded to the nearest quarter diopter.
If the resultant prism is over 1.00
you may require a slab-off.