Axis

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The axis (measured in degrees) tells the person making the spectacles what angle to position the lens so that the two curves are in the right place in front of the eye. A prescription which has a sphere and a cyl must have an axis.

The axis can only ever run from 0 to 180 degrees.

This feature will be shown with the following icon:

Axes (AXIS,AX,X)
The angle at which the cylinder is placed to give the best visual correction.