Glasses
Calculator
PD Measurement
Contact Lens Conversion
Convert eyeglass prescription to contact lens power, accounting for vertex distance
Reverse Eyeglass Calc
Calculate eyeglass prescription from contact lens power
Optical Knowledge
How to Measure PD
- Face a mirror, looking straight ahead
- Place a ruler horizontally at pupil center level
- Measure from each pupil center to the bridge of the nose
- Add the left and right measurements for total PD
Notes
- Results are for reference only. Consult a professional optometrist for actual prescriptions
- + indicates hyperopia, - indicates myopia
- For high myopia (over 4D), conversion errors are larger; consult an eye doctor
- Different contact lens brands and materials may require power adjustments
Usage
Features
Calculator tool.
Steps
Enter data and get results.
Notes
Results are for reference only.