May 14, 2012 · The axis is defined with a number from 1 to 180. The number 90 corresponds to the vertical meridian of the eye, and the number 180 corresponds to the horizontal meridian. If an eyeglass prescription includes cylinder power, it also must include an axis value, which follows the cyl power and is preceded by an "x" when written freehand.

On the other hand, axis describes the lens meridian that contains no cylinder power to correct astigmatism. And it is defined with a number from 1 to 180. The number 90 corresponds to the vertical meridian of the eye, and the number 180 corresponds to the horizontal meridian. So they are different from each other.

Yes, the astigmatism axis is very important to make prescription eyeglasses if you have astigmatism. If you provide incorrect astigmatism axis, you may get blurred vision or headaches even if the eyeglasses are made in exactly the right SPH, CYL and PD etc.

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The eye prescription is a result about whether you need visual correction. There are a series of items are measured by number within a plus (+) or minus (-) sign. For example, minus means you are myopic and plus is described as hyperopic.

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