We understand that many look at their prescriptions and see only a confusing jumble of numbers, symbols, and abbreviations. The following guide will help you decipher this important information.
Here are some examples of how your prescription might look:
Example 1:
| |
SPH |
CYL |
AXIS |
ADD |
| O.D. |
-3.75 |
-1.25 |
178 |
+2.5 |
| O.S. |
-3.75 |
-1.50 |
180 |
+2.5 |
Example 2:
| |
|
SPH |
CYL |
AXIS |
PRISM |
| DISTANCE |
O.D. |
-1.00 |
-0.25 |
005 |
|
| |
O.S. |
-1.75 |
|
|
| NEAR |
O.D. |
+1.50 |
-0.25 |
005 |
|
| |
O.S. |
+0.75 |
|
|
Example 3:
R: -3.75 / -1.25 x 178
L: -3.75 / -1.50 x 180
First, let’s translate the abbreviations.
O.D. = right eye. In example 1, the top row contains measurements for the right eye.
O.S. = left eye. In example 2, the bottom row contains measurements for the left eye.
SPH = SPHERE power, or the main correction power which corrects refractive error.
CYL = CYLINDER power corrects astigmatism refractive error.
AXIS = shows where an astigmatism is located along the eye’s horizontal axis.
ADD = the amount added to the sphere (SPH) value for those requiring reading glasses, bifocal or progressive lenses.
PRISM = indicates the image’s displacement value through the lens for those with unusual conditions like a squint or lazy eye. (more eyeglasses details …)
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