information for your left eye and right eye.
The top row (O.D.) is the information for your right eye, The second row (O.S.) is the information for your left eye.
SPH = SPHERE - The amount of long or short sightedness.
CYL = CYLINDER - This is the measure for astigmatism.
AXIS - This will only appear if there is a value for cylinder
PRISM is a box on the rx prescription form that is not normally filled in.
ADD = ADD POWER (Sometimes referred to as SEG POWER as well)- If you want to order read-only glasse or MULTIFOCAL LENS (bifocal or progressive) the ADD POWER represents how much power gets added to the distance Rx, for your reading-only Rx or for the bottom half of your bifocals/progressive lens.
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