Understanding your prescription
Your prescription is based on the shape of your eyeball, the curvature of your cornea and the ability of your eye’s lens to relax and contract to change the focal depth.
If your eyes have defects in their curves/shape or lens reshaping, then the beams of light that reach the back of your eye (the retina) will be unfocused and result in blurry vision.
We can redirect those beams of light to the correct spot on your retina by working backwards. If you get blurry vision because your eyes bend light this way, we’ll use lenses to do the opposite and bend the light that way instead. The effects of the lenses and your eyes cancel out and your crisp vision is restored.
So if someone has perfect vision, they can put on your glasses and get a sense of the opposite of how you normally see!
Sphere: This is the power required to correct your basic near-sightedness or far-sightedness.
Cylinder: This is the power required to correct your astigmatism (if you have any).
Axis: This is the angle from the horizontal at which the cylindrical power starts to get added to the Sphere.
ADD: This is the additional power required to add to your Sphere to allow you to read
Prism: This is the shift in focusing required to converge the images your get from both eyes.