Astigmatism Test (Self-Check)

Glasses Atlas · Free tool

Astigmatism self-check

The classic dial test. If some lines look darker or sharper than others, it can be a sign of uncorrected astigmatism. This is a quick informational check, not a diagnosis.

How to do it
  1. If you wear glasses or contacts for distance, keep them on.
  2. Sit about an arm's length from the screen, in good light.
  3. Cover one eye with your hand, without pressing on it.
  4. Look at the centre dot and notice the lines around it.
  5. Then repeat with the other eye covered.

Look at the centre. Do all the lines look equally black and sharp?

What did you see (each eye)?

How the astigmatism dial test works

The short answer: the dial is a wheel of evenly spaced lines. An eye with little or no astigmatism sees them all equally dark and sharp. An eye with uncorrected astigmatism focuses one direction better than another, so the lines along one axis look bolder or clearer while others look faint or grey. It is a quick prompt, not a diagnosis.

From our test bench. The dial is genuinely useful for one thing: noticing that something is uneven. It cannot measure how much astigmatism you have, or the axis, because a screen is not calibrated and everyone sits at a different distance. We treat a lopsided dial as a nudge to book an exam, nothing more.

Astigmatism test FAQ

Is astigmatism serious?

No. Astigmatism is a very common, harmless difference in the curve of the eye, not a disease. It is corrected fully with glasses or contacts using a cylindrical lens.

Can this test diagnose astigmatism?

No. It can only hint that one eye focuses unevenly. Screens vary in size and brightness, and distance changes the result, so only an eye exam can confirm astigmatism and measure it.

What does astigmatism feel like?

Common signs are blurry or stretched vision at all distances, eye strain, squinting, and lights that look streaked or haloed at night. These can have other causes too, which is why an exam is the way to be sure.

How is astigmatism corrected?

With a cylindrical lens that adds focusing power in one direction to balance the uneven curve. It appears on your prescription as the CYL and AXIS values. See what is astigmatism.

Last updated: August 9, 2026 · Glasses Atlas Team · General information, not medical advice · More free tools