All lines look similar
No obvious difference was noticed in this simple screen, but routine eye exams are still important.
A moment for your vision
Astigmatism test
Compare the clarity of radial lines, one eye at a time.
- About 2 min
- No sign-up
For screening only. This does not replace a professional eye exam.
Find good lighting
Avoid reflections on the screen.
Cover one eye
Cover gently without pressing.
Compare the lines
Notice differences in each direction.
A simple guide
How to take the test
Set up your screen and eyes carefully so you can compare the dial lines as consistently as possible.
- 1
Prepare your screen
Set brightness to a comfortable level, remove glare, and sit about an arm’s length from the screen.
- 2
Test one eye at a time
Keep both eyes open, but gently cover the eye you are not testing without pressing on the eyelid.
- 3
Compare every direction
Look at the center dot and choose the answer that best describes the radial lines for each eye.
Glasses or contacts: Wear your usual distance glasses or contact lenses unless you want to compare how the dial looks without them. Test under the same conditions for both eyes.
What your result may mean
Astigmatism can make lines at certain angles appear darker, sharper, blurrier, or more distorted than others. It happens when the cornea or lens curves unevenly, so light does not focus at a single point.
An online astigmatism test cannot measure a prescription or confirm a diagnosis. Screen quality, glare, viewing distance, dry eyes, and how well the other eye is covered can all influence the dial.
Some lines stand out
Darker, sharper, blurrier, or distorted lines may suggest an uneven focus that should be checked professionally.
The result is unclear
Rest your eyes and repeat the screen in good lighting, or ask an eye care professional if you remain unsure.
Frequently asked questions
Common questions about online astigmatism screening.
What is an astigmatism test?
An astigmatism test checks whether your eye focuses different line orientations equally. A radial dial is a common screening pattern: if some spokes appear darker, clearer, or more blurred than others, your eye may be focusing unevenly.
Can an online astigmatism test diagnose astigmatism?
No. This online test is a general screening tool only. An optometrist or ophthalmologist diagnoses astigmatism with calibrated instruments and can determine whether you need a glasses or contact lens prescription.
Why do some lines look darker than others?
With astigmatism, light may focus differently along different directions because of an uneven corneal or lens curve. Screen glare, pixel density, dry eyes, and viewing angle can also make certain lines appear different.
Should I wear glasses during the test?
Wear your usual distance glasses or contact lenses for a check of your corrected vision. You may also repeat the test without them for comparison, but keep the same setup when testing both eyes.
What should I do if the result suggests astigmatism?
Book a comprehensive eye exam, especially if you have blurred vision, headaches, eye strain, squinting, or difficulty seeing at night. Seek prompt care for sudden vision changes, eye pain, flashes, or a new shower of floaters.
Related eye tests
Explore other free vision screening tools.