What does my Optical Prescription mean?

Sph: This indicated the basic degree of short or long-sightedness. Minus (-) means you are shortsighted and plus (+) means longsighted.

Cyl: This is your level of astigmatism, which is the amount of "extra" prescription you have.

Axis: This denotes the cyl described above.

Prism: Prism is sometimes prescribed when eyes need help working together. If you are having spectacles for near vision or to help prevent headaches, prism may be included in your prescription.

Your Add: This denotes the "extra" power you need for close work (Near Add) or armslength (Inter ADD).