Understand your glasses or contact lens prescription.
Understand your glasses or contact lens prescription.
SE = SPH + CYL/2
SPH -2.50, CYL -0.75 → SE -2.875 (Mild Myopia).
Enter values above and click Calculate. All computation happens locally in your browser — no data is sent to any server.
What is Vision Prescription Calculator?
Understand your glasses or contact lens prescription.
Formula used?
SE = SPH + CYL/2
Is it free?
Yes! All CalcNest AI tools are 100% free.
Is my data safe?
All calculations run locally. We never store or transmit your data.