What does the AXIS number mean?

AXIS only appears alongside CYL. It tells the lens at what angle to place the cylindrical correction so it aligns with your astigmatism.

The scale runs 0° to 180°, measured counter-clockwise from the right horizontal:

• 0° / 180° — fully horizontal. With-the-rule astigmatism (the most common).
• 90° — fully vertical. Against-the-rule astigmatism.
• 45° / 135° — oblique. Less common, can be harder to correct.

Even small axis errors (±10°) measurably blur vision. Toric contact lenses include physical stabilisers — usually a thicker lower portion or peripheral zones — so the axis stays put on the eye despite blinks.

If your toric lens drifts and vision blurs unpredictably, the brand may not stabilise well on your eye shape — your optician can switch to a different stabilisation design.