Now after you understand many abbreviations in your eyeglass prescription, let's learn how to read eye prescription from the example below.
OD -2.00 SPH +2.00 add 0.5 p.d. BD
OS -1.00 -0.50 x 180 +2.00 add 0.5 p.d. BU
From this case, your doctor prescribes OD -2.00 for the correction of myopia in your right eyes. There is no astigmatism correction for your right eyes, so no axis is noted. Then for left eyes indicated by OS is being prescribed -1.00 for myopia and -0.50 cylinder for astigmatism correction.
While the cylinder power or axis is at 180 meridians. It means the meridian of the eye has no added power for astigmatism and the vertical (90-degree) meridian gets the added -0.50. Besides an add power of +2.00 is being prescribed for the correction of presbyopia in both eyes.
How to Read My Eye Prescription
To make you understand more how to read eye prescription, we will give you another eye prescription example and an explanation of it. Read carefully the way on how to read eye prescription below.
- OD: -2.00 – 0.50 x 180
- OS: +1.00 DS
- ADD: +1.75 OU
In this case, we see the first number of the right of OD is -2.00. This refers to the "sphere" part of the prescription. The sphere numbers indicated nearsightedness or farsightedness. A sign of minus (- means a negative-powered lens that is used to correct nearsightedness. While the positive sign (+ indicates a positive -powered lens that correct farsightedness.
Still, in OD, the next number is – 0.50. This represents the "cylinder" that measures the degree of astigmatism. Then x 180 means Axis 180. It refers to the angle in degrees from 0 to 180.
For the left eye, the "sphere" number is plus one (+1.00) DS. DS means "diopters sphere". It indicates that the left eye’s correction has no astigmatism. Finally, the ADD number of +1.75 indicated the power that needs to be "added" to the distance prescription. It aims to give the patient a clear vision at a close range for reading and near point activities.