Sph (Sphere) = this is the amount of power required to correct your vision.
· Negative means your lenses are used to correct your distance vision
· Positive means your lenses are used to correct your near vision
Cyl(cylinder) = This shows the amount of correction needed to remove any visual distortion. The Visual distortion is usually caused by an irregularly shaped cornea.
Axis = this is a unit between 0 degrees to 180 degrees; this is built in your lenses to correct to astigmatism (irregularly shaped cornea).
Prism = this correction is made to balance your eye muscles for comfort.
Base = the direction of the prism built in your lenses.