How to browse lens Prescription

When you look into your prescription for Prescription Eyeglasses, you may see numbers listed beneath the headings of OS and OD. they're Latin abbreviations; OS (oculus sinister) means that the left eye and OD (oculus dextrus) means that the proper eye. often you may see a notation for OU, which implies one thing involving each eyes. In general, the more faraway from zero the amount on your prescription, additional severe|the more serious} your sightedness and therefore the more vision correction you wish. A sign before of the amount means that you're farsighted and a sign means that you're myopic. These numbers represent diopters, the unit wont to live the correction, or focusing power, of the lens your eye needs. unit is usually abbreviated "D." For example, if your prescription says -1.00, you have got one unit of ametropia. this can be a reasonably gentle quantity of ametropia. If you're -4.25, which means you have got four and 1/4 diopters of ametropia. this can be a lot of myopic than -1.00, and needs stronger (thicker) lenses. Similarly, +1.00 would be atiny low quantity of hypermetropia and +5 would be a lot of. For people that have astigmatism, there'll be 3 numbers in your prescription. the overall kind for writing these numbers is S x C x Axis The S refers to the "spherical" portion of the prescription, that is that the degree of ametropia or hypermetropia mentioned on top of. The C refers to the "cylinder" or astigmatism, and may be a negative or a positive range. It measures in diopters the degree of astigmatism that you just have. the larger this range, the a lot of astigmatism you have got. The Axis could be a range anyplace between zero and one hundred eighty degrees. It reveals the orientation of the astigmatism it's not enough to specify what proportion astigmatism there is; you have got to understand wherever the distinction in curvature is happening. Here area unit 2 samples of what prescriptions for eyes with astigmatism might look like: -2.00 +1.50 x 180 +3.50 +3.00 x 45 The first prescription implies that the person has two diopters of ametropia with one.5 diopters of astigmatism ANd an axis of one hundred eighty degrees. The second prescription implies that the person has three.5 diopters of hypermetropia, three diopters of astigmatism ANd an axis of forty five degrees.