Your eyes turn inward when reading, so your "Near PD" is typically 2-3 mm narrower than your "Distance PD".
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 how to buy reading glasses from prescription
If SPH is +1.00 and ADD is +1.75 , your reading power is +2.75 . Your eyes turn inward when reading, so your
Use this formula for each eye separately: . Your eyes turn inward when reading
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