So, you just finished your comprehensive eye examination. Now you have your own eyeglass prescription. Have you ever go through your prescription. Whether you’re already a spectacle wearer or newbie you don’t really understand what your optometrist says about your vision. But knowing your prescription makes you a better understanding of your eyes.
Eyeglass prescription decoded:
Most of the optometrists or ophthalmologists use Latin words and ophthalmology terms and abbreviations.
O.D. stands for oculus dexter, meaning right eye (R.E.)
O.S. stands for oculus sinister, meaning left eye (L.E.)
O.U. stands for oculus uterque, meaning both the eyes (B.E.)
SPH (DS or Sphere): These numbers are measured in diopters (D) and indicate how strong your lens power, prescribed to correct your nearsightedness or farsightedness. If it starts with minus sign (-) then your nearsightedness (myopia); plus sign (+), your farsightedness(hypermetropia).
CYL (DC or Cylinder) records the amount of astigmatism, a condition where the cornea is irregularly shaped thus causing the vision blurred.
AXIS (X) = the degree and direction of your astigmatism.
PRISM = the amount of prismatic power, measured in prism diopters.
BASE = the direction of the prism is indicated by denoting the relative position of its “base”. Four abbreviations are used for prism direction: BU = base up; BD = base down; BI = base in; BO = base out.
ADD = the amount of power added to the distance prescription (this is your reading power).
DV = distance-vision.
NV = near-vision.
PD = pupillary distance (distance between your right pupil and left pupil, measured in millimetres). Usually, we write distance PD first and then for near.
-050 = -0.50
+175 = +1.75