Usually you will see abbreviations along the left side.
OD- This stands for Ocular Dexter, a latin term for Right Eye.
OS- This means Ocuclar Sinister, meaning left eye.
Then on the top there is:
Sphere (SPH) This is the overall eyeglasses prescription power, this is how strong your lenses need to be to correct your vision.
Cylinder (CYL) indicates astigmatism, a condition where the cornea is irregularly shaped, causing blurred and distorted vision. It also gives the lens strength needed to correct it.
Axis- This is extra power added to the lower part of a multifocal lens. It corrects a condition called presbyopia, which is when the eyes cannot focus on near things due to age.