Glasses Prescription Calculator
Convert, compare, and understand your eyeglass prescription with our comprehensive calculator
D
D
°
mm
Cylinder Format:
Prescription 1
Prescription 2
Prescription Results
SPH
Sphere Power
-
CYL
Cylinder Power
-
AXIS
Axis
-
SE
Spherical Equivalent
-
Prescription Summary
Enter values to calculate
Lens Correction Diagram
Prescription Terms Explained
SPH (Sphere)
Corrects nearsightedness (minus values) or farsightedness (plus values). Measured in diopters (D).
CYL (Cylinder)
Corrects astigmatism by compensating for irregular corneal curvature. Can be plus or minus.
AXIS
Orientation of the cylindrical correction, measured in degrees from 0 to 180.
PD (Pupillary Distance)
Distance between the centers of your pupils, important for proper lens alignment.
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