Spherical Equivalent Refraction (SER)
Eye care professionals use the term spherical equivalent refraction (SER) to refer to an eye's effective focusing power if only spherical aberration were present. SER can be defined as:
Read more about this topic: Eyeglass Prescription
Famous quotes containing the word equivalent:
“Divorce is the psychological equivalent of a triple coronary bypass.”
—Mary Kay Blakely (20th century)