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Your Prescription (Rx) is what an ophthalmologist (an MD) or optometrist (a doctor of optometry) provides to correct your vision with a pair of eyeglasses with corrective lenses. ... Each row of an Rx has three main sections: Sphere (SPH), Cylinder (CYL), and AXIS. The SPH section corrects nearsighted or farsighted vision. The Rx Range subtracts the power (.75, 1.25, or1.75) from the near power for the intermediate (upper part of the lens) Examples: Rx is Plano – 0.50 x 80 with +1.50 add, DLS Task Lens would read +1.00 – 0.50 x 80 in the near zone, .75 range would.