Vertexing Calculators

Contact Lens Vertexing Calculator

Calculate contact lens power from spectacle Rx.

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Reverse Vertexing Calculator

Calculate spectacle Rx from a contact lens Rx.

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Ultimate Vertexing Calculator

Calculate lens power given two vertex distances.

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Other Calculators

Oblique Fresnel Calculator

Calculate what magnitude and orientation of oblique Fresnel prism.

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Javal's Rule Calculator

Estimated residual astigmatism based off corneal Ks.

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Plus-minus Cylinder Converter

Convert plus cylinder prescriptions to minus cylinder prescriptions or vice-versa.

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Visual Acuity From Letter Size Calculator

Calculate visual acuity from letter size and distance.

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Cycles Per Centimeter to Visual Acuity

Calculate visual acuity from cy/cm and distance.

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