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Power calculator

Spectacle to contact lens power

Spectacles sit about 12 mm in front of the eye, so above roughly 4 dioptres the contact lens power is not the same as the spectacle power. This calculator shows the vertex corrected value.

Your spectacle prescription

Leave at 0 if your prescription has no cylinder.
The gap between spectacle lens and eye. 12 mm is typical.

Suggested contact lens power

Sphere
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Cylinder
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A guide only, rounded to the nearest 0.25 D. The final power, base curve and design are decided by your practitioner at the fitting. Multifocal and EDOF lenses are selected during the fitting too.

Have your prescription ready?

Take it to an authorised practitioner for a fitting and a trial pair.

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