How to Read Your Eye Prescription: OD, OS, SPH, CYL, AXIS
How to Read Your Eye Prescription By Dr. Ravi Raithatha, OD · Published October 20, 2026 O.D. is your right eye and O.S. is your left. SPH is the strength of the lens, and the minus or plus sign tells you whether you’re nearsighted or farsighted. CYL is how much astigmatism you have, AXIS is […]