An eye prescription is based on eye features including corneal curvature, anterior chamber depth, lens thickness, and the axial length of the globe (whole eye). Sphere, Cylinder, and Axis on Eye Prescriptions. How Stable is Your Eyeglass Prescription? - EyeQue See additional information. How to read your prescription Hopefully this article has helped explain a bit about what an eyeglass prescription is, and how to read/decipher it. How Do You Know If Your Eyeglass Prescription Is Too Strong? When you look at your prescription for eyeglasses, you will see numbers listed under the headings of OS and OD. Use the instructions to find where the text on the screen just barely starts to blur. The number might be very small, like 0.25, or a large number, like 6.00. Wearing the wrong glasses or lenses exerts a tremendous amount of eye strain symptoms causing a headache. Eye +/- Sphere +/- Cylinder Suggestion O.D. At the end of your eye test, you'll be given a prescription which will usually be valid for two years. It is calculated as the difference between the power needed for the eye to have a clear far sight and the value needed to have a clear near vision. Blur simulator: What you'll see without your glasses … All you need to do is put on your glasses and cover one of your eyes (the precise eye does not matter). DISCLAIMER. Do this by closing your right eye. The cylinder is the amount of ovalness and the axis is the orientation of the oval (vertical is 90 degrees and horizontal 180 degrees and other numbers are in between). eye coordination depth of perception focusing ability color vision 20/15 vision is actually better than 20/20. To convert to 20/20-based, you divide 20 by the distance you read from and then multiply that to the second number of the line you read. I won't consider -3.5 bad it's mild to moderately nearsighted. 20 Vision: How to convert 20/20 based measure
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