Eye Prescription Eye Prescription Chart How to Read an Eye Prescription OD and OS Prescription Reading Glasses Reader Confidence Reading Glasses Prescription SPH CYL AXIS How to Read Your Eye Prescription in Plain English TL;DR: An eye prescription is a set of instructions describing the lens correction needed by your right and left eyes. OD and OS identify each eye, SPH describes the main lens power, CYL and AXIS describe astigmatism cor… Team Debby a few seconds ago