SPHERE is the amount of Near-sighted or Far-sighted correction.
(+) PLUS sign signifies that the individual is FAR-sighted.
( - ) MINUS sign signifies that the individual is NEAR-sighted.
CYLINDER is the AMOUNT of astigmatism in each eye.
AXIS shows the LOCATION of the astigmatism in each eye.
ADD refers to how much power is added on for a bifocal or
progressive lens, and is also commonly referred to as ADD Power.
PRISM is the direction and quantity of shift in image correction
to align the eyes.
