How to Read Eye Prescription for Reading Glasses: A Complete Guide to Understanding Numbers
To read your eye prescription for reading glasses, first find the OD (right eye) and OS (left eye) values. Check for SPH, which shows lens power. A “+” means farsightedness, and a “-” means nearsightedness. ADD indicates any extra power needed for reading. To calculate total strength, add SPH and ADD. The Cylinder measures astigmatism, … Read more