Rx Transposition

Convert minus-cylinder to plus-cylinder form; axis rotates 90°.

Medical Disclaimer

This calculator is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making decisions about your health. Never disregard professional medical advice or delay seeking it because of results from this tool.

Inputs

Sphere (D)

Cylinder (D)

Axis (°)

Tab to move between fields

Results

Sph (−cyl)

-2.5

Cyl (−cyl)-0.75

Sph (+cyl)-3.25

Cyl (+cyl)0.75

New axis90

How to Use This Calculator

Locate your eyeglass prescription from your optometrist.
Enter the sphere (SPH), cylinder (CYL), and axis values for each eye.
Read the converted notation in the output panel.
Compare the output with your lens order form to verify accuracy.
Consult your eye-care professional before ordering lenses.

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