YOUR PRESCRIPTION EXPLAINED
Once your eye examination is complete, your Optometrist will give you a prescription. Let our trained Opticians find the right lens and frame to fit your every day needs. Do you ever wonder what all the symbols and abbreviations on the prescription mean? Here is a short explanation.
Rx - Prescription
OD - Right eye
OS - Left eye
Sphere - This is measured in Diopters (D). It indicates the amount of myopia (near sightedness) or hyperopia (farsightedness). A minus sign indicates myopia while a plus sign indicates hyperopia. The word plano (pl) is used to indicated zero power.
Cylinder - This measures the amount of astigmatism. It is also measured in Diopters and is usually a minus sign.
Axis - This measures the direction of the astigmatism.
Add - This is the power added to the distance prescription to allow patients to read. This is usually used for patients that are 40 years of age or older. This is always written in a plus sign.