Everything you need to know to understand and send your prescription.
Sometimes prescriptions can be confusing, so we?ll explain the most common formats.
Your prescription might look like these examples:
Here?s what prescription terms mean:
|RE or OD
||Right eye (R)
|LE or OS
||Left eye (L)
||Spherical power (you will find numbers like -0.50,-0.75, 1.50, +1.50, etc)
||Cylindrical power (you will find numbers like -0.50,-0.75, 1.50, +1.50, etc)
||It is axis of cylindrical power (you will find numbers between 1° to 180°
||Pupillary Distance, It is the distance between the left and right pupil. (usually it ranges between 48mm to 73mm for adults and 41mm to 55mm for children for both eyes. )
Sphere (SPH):This indicates the amount of lens power, measured in diopters (D), prescribed to correct the refractive errors
Cylinder (CYL):This indicates the amount of lens power for astigmatism. If nothing appears in this column, you have no astigmatism.
Axis:The axis is defined with a number from 1 to 180.
If an eyeglass prescription includes cylinder power, it must include an axis value, which follows the cyl power.
Add: This is the added power applied to the bottom part of progressive or bifocal lenses to correct presbyopia. The number appearing in this section of the prescription is always a "plus" power, even if it is not preceded by a plus sign. Generally, it will range from +0.75 to +4.00 D.