Your dominant eye is the one your brain relies on more heavily for positional information. About two out of three people are right-eye dominant, while roughly one in three are left-eye dominant. Finding out which eye leads your vision takes less than a minute with a simple at-home test, and the answer matters for everything from shooting sports to vision correction surgery.
The Miles Test: Fastest Way to Check
The Miles test is the most widely used method for finding your dominant eye, and you can do it right now with no equipment. Here’s how:
- Pick a target. Choose a small object across the room: a light switch, clock, or doorknob.
- Make a triangle with your hands. Extend both arms in front of you and overlap your thumbs and forefingers to create a small opening between your hands.
- Center the target. With both eyes open, look through that opening at the object. Keep your arms fully extended.
- Close your left eye. If the object stays centered in the opening, your right eye is dominant. If the object jumps out of view, your left eye is dominant.
You can confirm by repeating the test and closing the right eye instead. The eye that keeps the object lined up in the opening is your dominant eye. Most people get the same result every time, but it’s worth running through it two or three times to be sure.
The Hole-in-the-Card Test
This variation, sometimes called the Dolman method, uses a piece of cardboard or thick paper with a hole punched in the center (about the size of a quarter). Hold the card with both hands at arm’s length and look through the hole at a target roughly 20 feet away. While you keep both eyes open and stare at the target, slowly bring the card back toward your face without losing sight of the object. The card will naturally drift toward one eye. Whichever eye the hole ends up over is your dominant eye.
Eye care professionals sometimes use this test in clinical settings because it includes a built-in confirmation step. An examiner can also cover each of your eyes alternately while you hold the card steady to see which eye stays aligned with the target. If the object disappears when one eye is covered, the covered eye is the dominant one.
The Pointing Test
If you don’t have a card handy, try this even simpler version. Extend one arm and point your index finger at a distant object with both eyes open. Now close one eye at a time. With your dominant eye open, your finger will stay right on target. With your non-dominant eye open, your finger will appear to jump to one side. The shift happens because your brain was using the dominant eye’s line of sight to aim your finger in the first place.
Eye Dominance and Handedness
Eye dominance and hand dominance tend to match, but not always. A study of 160 adults found that about 72.5% had their dominant eye and dominant hand on the same side. Among right-handed people, most were right-eye dominant. Among left-handed people, most were left-eye dominant, though the numbers were smaller. The roughly one in four people whose dominant eye and dominant hand are on opposite sides are called “cross-dominant,” and this is completely normal.
Cross-dominance becomes practically important in aiming sports. If you’re right-handed but left-eye dominant, your natural line of sight doesn’t match the side you hold a rifle, pistol, or bow. Some shooters and archers learn to close their dominant eye while aiming. Others switch to shooting from the opposite side entirely, which can mean replacing handed equipment like bows, sights, and arrow rests. A third option is visualization and form drills (like “blind bale” shooting in archery, where you practice your shot sequence with eyes closed) to build consistent muscle memory regardless of which eye leads.
Why It Matters for Vision Correction
Your eye doctor will test for dominance before prescribing monovision contact lenses or planning certain refractive surgeries. In monovision, the dominant eye is corrected for distance vision while the non-dominant eye is left slightly nearsighted for reading and close work. Getting the assignment backward can make the whole approach feel disorienting, so accurate dominance testing is a key part of the fitting process.
Dominance also plays a role in cataract surgery decisions when different lens implant powers are placed in each eye. Knowing which eye your brain trusts more for distance helps the surgeon choose the lens combination that will feel most natural afterward.
Can Your Dominant Eye Change?
Eye dominance is generally stable through adulthood, but it isn’t permanently locked in. Research on short-term monocular deprivation (covering one eye for a period of time) has shown that the brain can shift its preference. After one eye is patched, the visual system temporarily boosts the contribution of that eye once it’s uncovered, while the eye that stayed open becomes relatively weaker. These shifts reflect genuine neuroplastic changes, not just fatigue.
In practice, this means conditions that reduce vision in one eye over time, such as cataracts or significant changes in prescription, can gradually shift dominance. Some people also find that their test results vary depending on whether they’re looking at a near or far target, because dominance for close-up tasks can differ from dominance at distance. If your results seem inconsistent, try testing at both ranges and note whether the same eye wins each time.