AXS, or Axis, refers to the angle of the correction for the astigmatism in the eye (if one exists) from 1 to 180. If there is an Axis value on an eye, there must be a CYL (Cylinder) value on that eye. If there is no Cylinder value or if the value is zero, the OD Axis value is entered as 0.00.

The Axis value is usually written as 3 digits, which means if your Axis value is 5, it is often written as 005. This Axis value is still 5, regardless of how it is displayed.

OD Axis is Axis correction for your right eye.

OS Axis is Axis correction for your left eye.