How it's measured
This uses the classic "Miles test" (or hand-triangle test) for eye dominance: when both eyes are open, your brain blends the two slightly different views into one. Closing your non-dominant eye barely shifts what you see, since your brain was already leaning on the other eye — so the object stays framed. Closing your dominant eye removes the view it was relying on, so the object appears to jump.
Frequently asked questions
What is eye dominance?
Most people have one eye their brain relies on slightly more for aiming and depth — similar to handedness, and usually unrelated to which eye sees more sharply.
Why does this need my hands instead of just clicking?
Eye dominance is a physical, real-world effect involving how your two eyes line up with a distant object — a screen alone can't measure that, so this test guides you through the real method and asks what you observed.
What if the result seems inconsistent?
Try it two or three times with a clear, distant object. A genuinely mixed result is possible and not a cause for concern.
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