Eye Power Calculator
Analyze your vision prescription and understand your eye health
Educational Tool
Right Eye (OD)
Enter your right eye prescription values
-: Myopia, +: Hyperopia
Astigmatism correction
0-180 degrees
Reading addition
Analysis
Left Eye (OS)
Enter your left eye prescription values
-: Myopia, +: Hyperopia
Astigmatism correction
0-180 degrees
Reading addition
Analysis
Pupillary Distance (PD)
Distance between your pupils in millimeters
Average: 63mm (adults)
Range: 54-74mm
Lens Recommendations
Suggested lens options based on your prescription
Lens Material
Sufficient for mild prescriptions
Lens Type
For distance or near vision only
Coatings
Reduces glare and improves clarity
Prescription Format Converter
Convert between minus and plus cylinder formats
Right Eye Conversions
Minus Cylinder Format:
SPH: 0.00 | CYL: 0.00 | AXIS: 0°
Plus Cylinder Format:
SPH: 0.00 | CYL: 0.00 | AXIS: 0°
Spherical Equivalent:
0.00 D
Overall refractive power
Left Eye Conversions
Minus Cylinder Format:
SPH: 0.00 | CYL: 0.00 | AXIS: 0°
Plus Cylinder Format:
SPH: 0.00 | CYL: 0.00 | AXIS: 0°
Spherical Equivalent:
0.00 D
Overall refractive power
Understanding Your Prescription
Prescription Terms
- • SPH (Sphere): Overall lens power for myopia (-) or hyperopia (+)
- • CYL (Cylinder): Astigmatism correction power
- • AXIS: Orientation of astigmatism (0-180°)
- • ADD: Additional power for reading (presbyopia)
- • PD: Distance between pupils for lens centering
Common Conditions
- • Myopia: Nearsightedness (SPH negative)
- • Hyperopia: Farsightedness (SPH positive)
- • Astigmatism: Irregular cornea curvature (CYL present)
- • Presbyopia: Age-related near vision loss (ADD needed)
- • Emmetropia: Normal vision (no correction needed)
Important: This calculator provides educational information only. Always get your eyes examined by a qualified optometrist or ophthalmologist. Prescriptions should only be obtained through professional eye exams. Regular eye check-ups are recommended every 1-2 years.
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