Many retailers like Zenni Optical or Warby Parker offer online tools or printable rulers to measure this at home. 3. Choose Your Lens Type How to Convert Eyeglass Prescription to Reading Glasses

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

If SPH is +1.00 and ADD is +1.75 , your reading power is +2.75 .

Your eyes turn inward when reading, so your "Near PD" is typically 2-3 mm narrower than your "Distance PD".

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