Near Vision & Add Calculator
Find the right power for reading, computer or close work.
1. Choose your working distance
2. Find your ADD value
3. Calculate your near prescription
4. Use for ordering reading or computer glasses
1. Choose your working distance
2. Find your ADD value
3. Calculate your near prescription
4. Use for ordering reading or computer glasses
Please remember: These calculators provide estimates based on your input and do not replace an eye examination or professional prescription advice.
Use the ADD Calculator
When you only know your working distance.
Use the Near Vision Calculator
When you already have a distance prescription.
For single vision reading, computer, or close work glasses.
ADD Calculator
Measure the distance from your eyes to your book, screen, or work surface -- then enter it below to find your ADD value.
Computer vs Reading distance
Reading usually needs more power than computer use because the working distance is shorter. The closer the task, the higher the ADD.
Near Vision Calculator
Enter your distance prescription and ADD value to get your reading glasses prescription.
How to Use Panto Calculator
- Enter your prescription
- Enter your ADD
- Your optimal glasses power is instantly calculated
- Make a note of power
- You can now order your new near vision glasses online or from an option
What is ADD?
ADD (Addition) is extra power needed for near tasks like reading or computer work. It's added to your distance prescription.
Reading vs Computer
Closer tasks need more power. Reading (40cm) requires more ADD than computer use (60-67 cm). Choose based on your primary need.
Progressive Lenses
Progressive lenses provide a range of powers in one lens for distance, intermediate, and near vision—no separate reading glasses needed.
Ready to order your glasses?
Choose your frame, select prescription lenses, and enter your calculated values for single-vision reading or computer glasses.
