The prescription is the description of the refraction needed to give you an optimal vision. It is described in diopters (D), with a minus – for those who are myopic/shortsighted, a plus + for those who are hyperopic/farsighted. This is the SPH value of your prescription

Addition (ADD) is the difference between far distance vision and reading (near) vision. It is always starting with a plus +, typically from +1,00D to +2,50D, while for the longer working distance for computer glasses, the add is typically +1,50 or +1,75D.

Cylinder (CYL) that describes the astigmatism is typically starting with a minus -, followed by the direction of the CYL, described as axis (AXE).