Calculator
Lens power calculator
Enter an Rx in plus or minus cylinder. Move the slider to read the power in any meridian.
Your lens
Steps of 5°. The exam table only covers meridians 0, 30, 45, 60 and 90° away from the axis.
Results
- Minus cylinder
- −1.00 −2.00 × 030
- Plus cylinder
- −3.00 +2.00 × 120
- Spherical equivalent
- −2.00 D
- Astigmatism
- compound myopic
Power in the 180° meridian (30° from the axis)
Exam method−1.50 D
Exact optics−1.50 D
Exam table: sphere + cylinder × 0, 25, 50, 75 or 100 %. Exact: sphere + cylinder × sin²(meridian − axis).