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What does axis mean on my prescription? Answer: The axis number on your prescription tells your optician in which direction they must position any cylindrical power in your lenses (required for people with astigmatism). This number shows the orientation or angle in degrees from 1 to 180. The number 90 means vertical position and 180 horizontal. A higher number for the axis does not mean that your prescription is stronger - it simply describes the position of the astigmatism. Prescription Was this answer helpful?
You can tell whether you have astigmatism by looking at your eye prescription. The box 'Cyl' will show the power you need to correct astigmatism, if you have one. Axis tells the manufacturer of the glasses or contact lenses where the astigmatism is and where the power should be to correct it. Causes of Astigmatism. Astigmatism is caused when the cornea of the eye becomes oblong or oval rather than spherical. A cornea which has astigmatism has two curves, a flat curve and a steep curve so light is focused at two points instead of more clearly at just one point.