A pair of prescription eyeglasses is one that is custom made by an optician based on the written prescription by an eye doctor or optometrist. Prescription eyeglasses mainly functions as a corrective instrument to make the wearer see clearer. Prescription eyeglasses cure the blurred vision caused by the myopia, hyperopia, astigmatism and presbyopia.
Prescription eyeglasses must be made in compliance with the written prescription from eye doctors. Most of the eyeglasses prescriptions in the world are not uniform in forms, but the major contents are the same. A wearable prescription eyeglasses needs some basic numbers to follow, here is an example of eyeglasses prescription:
O.D. -4.00(SPH) -0.5(CYL) 105(Axis)
O.S. -3.50(SPH) -1.00(CYL) 140(Axis)
ADD: O.D. +2.00
O.S. +2.00
O.D.: Latin abbreviation for “Right Eye”
O.S.: Latin abbreviation for “Left Eye”
SHP: Abbreviation for Spherical, means the degree of myopia, hyperopia or presbyopia.
CYL: CYL refers to “Cylinder”, means the degree of astigmatism.
Axis: Axis is a number from 0 to 180 meaning the orientation of astigmatism.
ADD: ADD means the additional refractive power. For single vision prescription eyeglasses, it represents a single vision lens prescription to improve the near vision; for bifocal prescription eyeglasses this means the degrees for the reading portion.
more info: How to read and enter prescription
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