How to Read an Eyeglass Prescription
Spherical error, or overall power of lens is the basic part of your prescription. A (+) means you have trouble seeing near, and a (-) means you have trouble seeing things faraway.
CYL (Cylinder) & Axis
A cylinder value indicates astigmatisms or perpetually blurry vision. Axis—measured between 1 and 180°— tell us the orientation of the astigmatism
This number is sometimes written NV for near vision and is used for multifocal lenses and readers