The axis is defined with a number from 1 to 180. Sphere, Cylinder and Axis | Pendleton Eye | Oceanside or a superscript triangle when written freehand), prescribed to compensate for eye alignment problems. This indicates the amount of lens power, measured in diopters (D), prescribed to correct nearsightedness or farsightedness. It always follows the sphere power on an eyeglass prescription. Commonly, this number will be different for each eye. Your prescription may have a base column, or it may be included in the same column as prism this gives further information about the required prism correction, telling us the orientation needed in the lens. & Worries-free! This means that a person can see the object clearly at 20 feet. If the PD/Pupillary Distance for the glasses is not set correctly then your eyes may have to strain to look through them, this can lead to headaches, eyestrain, visual distortion and in severe cases, double vision. This value is the amount to add on to the distance SPH values to ascertain what the full Near prescription should be. This number is followed by the base direction, or thickest edge, of the prism. You should have a number under the CYL column too. However, many opticians will simply write the value somewhere under, or next to, the distance values. When you hold the prescription, have you ever been curious to know what the number and letters mean for your eyesight? Nowadays, most of us wear glasses and most of us just take the prescription to the optical store to pick out a pair of glasses. Whats more, if an eyeglass prescription includes cylinder power, it also must include an Axis value, which follows the CYL power. CYL (Cylinder)CYL is a + or - value in 0.25 steps and is required to correct your astigmatism. Still dont know how to look for your perfect fit? If you experience difficulty in obtaining this measurement we can record it, if necessary, from an existing pair of your glasses, to find out more click here. Cylinder power is always written after sphere power in an eyeglass prescription. It does not matter whether the correction is of farsightedness or nearsightedness; it is always in spherical form. Home>Tips & Guides>How to Read an Eyeglass Prescription. VA, Visual Acuities- These values describe your vision (visual acuity) but are not needed to make your glasses. Base is the direction of a PRISM value and will only be supplied if the prescription has a PRISM value.
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