To buy reading glasses using a prescription, you must use your distance and Addition (ADD) values to calculate the correct lens power . 1. Calculate Your Reading Power
Your eyes turn inward when reading, so your "Near PD" is typically 2-3 mm narrower than your "Distance PD". how to buy reading glasses from prescription
If SPH is -2.00 and ADD is +2.25 , your reading power is +0.25 . To buy reading glasses using a prescription, you
If your prescription has Cylinder (CYL) and Axis numbers, copy them exactly; they do not change for reading glasses. 2. Adjust Your Pupillary Distance (PD) PD is the distance between your pupils in millimeters. copy them exactly
Use this formula for each eye separately: .
If SPH is +1.00 and ADD is +1.75 , your reading power is +2.75 .