Which Eye Is Your Dominant Eye?

weirdly accurate.

Which Eye Is Your Dominant Eye?

    Which eye is my dominant eye?

    Most likely your right one. In a summary of 13 sighting studies from 1929 to 1974, about 65% of people aimed with the right eye, 32% with the left, and about 3% showed no steady favourite (Porac & Coren, 1976). Your dominant eye is the one your brain uses to line things up when only one eye can do the job; it is not necessarily the eye that sees better.

    This test finds yours with two classic sighting tests you do with your own hands, each step framed inside a seaside coin-operated viewer. First you pick a small target at least 3 metres away. In the window test (Walter Miles, 1930) you frame it in a little triangle made with both hands; in the fingertip test (Giambattista della Porta, 1593) you cover it with an outstretched finger. Each time you close your left eye, then your right, and say whether the target stayed put or jumped: the eye that keeps it in place is the one lining it up. If the two tests disagree, a tie-break has you pull the window back to your face and see which eye it ends at. Last, you say which hand you write with, and the result tells you whether eye and hand are on the same side or crossed, with roughly how many people in 100 pair them your way, from a meta-analysis of 54,087 people.

    It is a sighting test, not an eye test: it says nothing about how well either eye sees. If one eye sees much worse than the other, you see double, or an eye drifts, see an optometrist or eye doctor. The page can’t see your eyes, so the result is only as good as what you report, and a target that is too close can make both eyes look the same. Eye dominance isn’t fixed either: in one study it swapped sides when people looked about 15.5° off to one side (Khan & Crawford, 2001), which is why both tests use a target straight ahead.

    What the test measures

    One thing: which eye your brain aims with, and whether it is on the same side as your writing hand.

    The task

    • A coin-operated seaside viewer frames each step; the tests themselves use your own hands and a real target at least 3 metres away
    • The window test (Miles, 1929–30): frame the target in a triangle of both hands, close one eye, then the other
    • The fingertip test (Porta, 1593): cover the target with an outstretched fingertip, close one eye, then the other
    • A tie-break only if the two disagree: pull the window back to your face and see which eye it ends at; then the hand you write with

    Your result

    • Right-eyed, left-eyed or no steady favourite, and how many of your tests agreed
    • How common that is: about 65% right, 32% left and 3% no favourite across 13 studies (Porac & Coren, 1976)
    • Writing hand × dominant eye: whether you are crossed, and about how many in 100 people pair them your way, worked out from Bourassa, McManus & Bryden’s 1996 meta-analysis
    • Reference points (adults and children in 1929, infants in 1974, monkeys and cats) and where it matters: cameras, telescopes, darts, archery
    • A share card and a challenge link that carries only your eye and hand, in the part after the #; no account

    Before you start

    • About a minute: ten quick steps, and one more only if the two tests disagree
    • A small target at least 3 metres away, such as a light switch or a door handle; on a big screen you can step back and use the lighthouse
    • Both hands free for the window test: on a phone, put it down while you frame the target
    • Works on phones and computers with 3D (WebGL) switched on

    Dominant eye FAQ

    Is this test free? Do I need to sign up to see my result?

    Yes, it’s free, and there’s nothing to sign up for: no account, no email, no payment. Your result appears on this page the moment you finish, and you can share it or play again straight away.

    How do I know which eye is dominant?

    Do a sighting test. Hold your hands out to make a small window around a distant object with both eyes open, then close one eye at a time: the object stays in the window only while your dominant eye is open. This is Walter Miles’s window test from 1929–30; Giambattista della Porta described a version with an outstretched pencil in 1593. Doing two such tests and checking that they agree gives a firmer answer than one.

    Is it more common to be right-eye or left-eye dominant?

    Right-eye dominance is about twice as common. Porac and Coren’s 1976 review of 13 sighting studies found that about 65% of people sight with the right eye, 32% with the left, and about 3% have no steady favourite. Individual studies ranged from 53% to 82% right-eyed, so the exact share depends on the test and the sample.

    What does cross-dominant mean?

    Cross-dominant, or crossed, means your dominant eye and your writing hand are on opposite sides, for example right-handed and left-eyed. It is common: in Bourassa, McManus and Bryden’s 1996 meta-analysis of 54,087 people, 34.43% of right-handers and 57.14% of left-handers were left-eyed. Working from their figures, roughly 35 in 100 people are crossed.

    Is my dominant eye my better eye?

    Not necessarily. Porac and Coren’s review found that people whose two eyes see about equally well still show a dominant eye at the usual rates, and Mapp, Ono and Barbeito (2003) argue that it has no special role in seeing: it is simply the eye you use when only one can be used. A dominant eye test says nothing about how well either eye sees.

    Is a dominant eye test an eye exam?

    No. A dominant eye test is a sighting test and cannot find problems with your vision. If one eye sees much worse than the other, you see double, or an eye drifts, see an optometrist or eye doctor; signs like these can point to conditions such as lazy eye (amblyopia) that need a proper examination.

    Can your dominant eye change?

    It can depend on where you look. In Khan and Crawford’s 2001 study, the dominant eye swapped sides when people looked about 15.5° off to one side, which is why this test uses a target straight ahead. A result can also come out unclear if the target is too close or the window too big; a farther target usually settles it.

    Why does it matter which eye is dominant?

    It matters for anything you aim or look through with one eye: a camera viewfinder, a telescope, a microscope with one eyepiece, darts, archery or a pool cue. Putting the instrument to your dominant eye means using the eye your brain already trusts for lining things up.

    Where the numbers come from

    The 65/32/3 shares and the 1929 and 1974 reference points come from Porac & Coren’s 1976 summary of 13 older sighting studies, mostly from the US and Europe, using different tests. The writing-hand × eye shares are our arithmetic from three figures in the abstract of Bourassa, McManus & Bryden (1996); their model has no “no favourite” group. Porta’s 1593 account and Miles’s tests are described as Porac & Coren report them. There is no percentile: eye dominance is a category, not a score. The site does not publish its own players’ data.