Not all eyeglass prescriptions are the same. In order to be interpreted worldwide, eyeglass prescriptions are writtenin a standardized format with common notations. Notable terms include:
Sphere (Sph) : Sphere sph is the measurement of how much your eye needs to be corrected to see clearly. Sphere (Sph) is often referred to as “power” or “minus cylinder.” If the number appearing under this heading has a minus sign (–), you are nearsighted; if the number has a plus sign (+) or is not preceded by a plus sign or a minus sign, you are farsighted.