This number is usually between 13 and 15 and determines where on your eye the contact lens will sit. If this measurement isn't correct the contact lens will be uncomfortable and may scratch your eye.
CYL: Cylinder value. Axis: Expresses the orientation of the cylinder value on the lens. ADD: Add Power - the added magnifying power in portions of the lens to help with seeing up close in diopters. Your contact lens prescription may also include a brand name that carries the lenses your eye care provider felt would be the best fit. If you're choosing to cosmetically enhance your eye color with your lenses, that information will also be on the prescription.
In some cases the prescription also includes how often to replace the lenses whether they are daily, weekly, monthly etc. Shop All Contact Lenses. Shop All Men's Eyewear.
Shop All Women's Eyewear. Back Brands. Shop All Brands. If the verification request is received at 10 p. Monday, the response would be due by 5 p. The National Small Business Ombudsman and 10 Regional Fairness Boards collect comments from small businesses about federal compliance and enforcement activities. Small businesses can comment to the Ombudsman without fear of reprisal. You are here. Changes to the Rule go into effect October 16, Your Opportunity to Comment The National Small Business Ombudsman and 10 Regional Fairness Boards collect comments from small businesses about federal compliance and enforcement activities.
I Would Like To Stay Connected with the FTC. CYL - Cylinder usually a number between In addition to the lens power, your contact lens prescription contains several other pieces of information related to the size of the lens.
Even the power of the lenses is generally not the same as in your eyeglass prescription. This is because: The contact lens sits on the surface of your eye, while your eyeglasses sit about mm in front of your eyes Regular soft contacts do not correct for your astigmatism, but your eye doctor will typically try to partially correct for it by changing the power of the lens.
Base Curve BC : The base curve determines what type of fit is required for the lens to meet the curve of your eye; this is usually written in millimeters or sometimes with the words: flat, median or steep. Diameter DIA : The diameter of the contact lens is also written in millimetres and determines the width that best fits your eye.
This will be followed by a number that goes up from 0 in measures of 0. The below figures are only displayed on contact lens prescriptions where there is a need for astigmatism correction, and you require toric lenses. Cylinder CYL : The cylinder will always be a minus number that increases in measures of 0.
Axis AX : Astigmatism is caused by the irregular curvature of the eye; the axis is a figure which determines the angle of the correction needed in order to see clearly. The Axis is always a number between 0 and degrees. Addition ADD : If you suffer from presbyopia it affects your near vision, the Addition figure determines what level of correction you need to be able to see clearly at a close distance.
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