Quick Answer
ADD (Addition) is the extra magnifying power for reading/near vision, used in bifocal and progressive lenses. Typically ranges +0.75 to +3.50.
When You Need ADD
| Prescription | Lens Type |
|---|---|
| SPH only, no ADD | Single Vision (distance or reading) |
| SPH + ADD | Bifocal or Progressive |
At KEZVOR Checkout
If your RX includes ADD, select Progressive or Bifocal — not Single Vision.
Compare options: Progressive vs Bifocal