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 OD Axis value, there must be an OD CYL (Cylinder) value.
If there is no OD Cylinder value, or if the OD Cylinder value is Zero, then the OD Axis value is Zero.
The Axis value is usually written in 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.