Your prescription looks like a grid of numbers and abbreviations, but it is simpler than it seems once you know what each part means.
- OD is your right eye, OS is your left eye.
- SPH (sphere) is the lens power for near- or far-sightedness.
- CYL and AXIS describe astigmatism correction.
- ADD is the extra power for reading, used in progressive and bifocal lenses.
