![]() » CYL (or ZYL) = Cylinder (a number between -4.00 and +4.00). = The brand name given to the contact lens - for example "Soflens" or "Acuvue 2".įor astigmatic patients, there is also the following parameters: Multifocal (bifocal) lenses can include a numeric "Add Power" (ie, +2.00 or +1.50 etc.) for magnification, or the lenses / prescription simply says "Low" or "High" power magnification. The ADD value is only used for multifocal lenses. It is the amount of additional (+) power needed for correction of presbyopia (added multifocal power for near distance). This is the additional correction for bi-/multi- focal contact lenses. Many disposable contact lenses are available in only one diameter if you see only one choice for diameter you may confidently select it. ![]() This is the diameter (width/size) of your contact lens (e.g.,13.8,14.0,14.2, etc.) = Diameter (a number between 13.0 and 15.0). If your box or prescription says MEDIAN instead of a number for base curve choose 8.5, 8.6 or 8.7 only. ![]() Many contact lenses come in only one base curve, many others in only two base curves, some come in multiple base curves so care must be taken when ordering. This is the inside curve of your contact lens (e.g.,8.0, 8.1, 8.2, etc.). = Base Curve (a number between 8.0 and 10.0). If you are nearsighted (can see only near objects well) then order minus powers, if you are farsighted (can see distant objects) please order plus powers. = Power / Sphere (a number between -25 and +25). = Both eyes (your eyes have exactly the same parameter) In this column/section, you find the parameters for your right eye. In this column/section, you find the parameters for your left eye. On a contact lens box, you will find the same information:Įxample: Toric lens (lenses for astigmatism) ![]()
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