Short answer: your dominant eye is the eye you prefer to look with. To find it, make a small triangle with your hands, centre a distant object in it with both eyes open, then close each eye in turn. The eye that keeps the object in the triangle is your dominant eye. About two in three people are right-eye dominant (Bourassa et al., 1996). Try our free tester below; it takes about a minute and runs entirely on your device.

Dominant eye tester

You'll need about a minute. Use our dominance testing target on a laptop or TV about 3 metres away, or look at a small object across the room, such as a light switch or door handle.

  1. Stretch both arms out in front of you and overlap your hands to make a small triangle-shaped opening.
  2. With both eyes open, look through the opening and centre the object or target in it.
  3. Keep your hands still and close one eye, then the other, as the tester asks.

What is a dominant eye?

Most people have a preferred eye, just as they have a preferred hand. It’s the eye you naturally use for one-eyed tasks, such as looking through a camera, a telescope or the sight of a rifle (AAO). Your dominant eye isn’t necessarily your best-seeing eye, and for most people it has no bearing on day-to-day life (AAO).

There are two kinds of dominance:

  • Sighting dominance is the eye you line things up with. It’s what the hand triangle and hole-in-a-card tests measure.
  • Sensory dominance is the eye your brain favours when the two eyes see slightly different images, such as when one eye is a little blurred.

They don’t always agree. In a 2025 study of 326 people, the hole-in-a-card sighting test picked a different eye from a sensory test in 41% of people (Pepose et al., 2025). Dominance also isn’t completely fixed: in one experiment, people switched between left- and right-eye dominance when they looked only about 15 degrees off centre (Khan & Crawford, 2001).

How to find your dominant eye: three home tests

1. The hand triangle test

This is the test our tester uses.

  1. Pick a small object about 3 metres away, such as a light switch, door handle or clock.
  2. Stretch both arms out and overlap your hands to make a small triangle-shaped opening.
  3. With both eyes open, centre the object in the opening.
  4. Keeping your hands still, close your left eye. Then open it and close your right eye.
  5. The eye that keeps the object in the triangle is your dominant eye. With the other eye open, the object jumps out of view.

The American Academy of Ophthalmology describes the same test using a circle made with one hand (AAO).

2. The hole-in-a-card test

This is the version many eye clinics use as a first check (Pepose et al., 2025).

  1. Cut a hole about 3 cm across in the middle of a piece of card or paper.
  2. Hold it at arm’s length with both hands and look at a distant object through the hole, with both eyes open.
  3. Close each eye in turn. The eye that still sees the object through the hole is your dominant eye.

3. The everyday check

Think about which eye you put to a camera viewfinder, telescope, microscope or keyhole without thinking. That’s usually your dominant eye (AAO).

What if the test is unclear?

  • Make the opening smaller and choose an object further away.
  • Keep your hands still and your head facing straight ahead.
  • Repeat the test a few times, starting with a different eye each time.

If the result still flips between eyes, you may have weak or equal dominance. That’s common: in the 2025 study, only about half of people had strong dominance for distance (Pepose et al., 2025), and a small number of people have no dominant eye at all (AAO).

Left or right: which is more common?

Right-eye dominance is more common. A meta-analysis of 54,087 people from 54 populations found about one in three people are left-eye dominant, compared with about one in ten who are left-handed. There was no difference between men and women (Bourassa et al., 1996).

Left-eye dominant
EveryoneAbout 1 in 3 (37%)
Right-handed peopleAbout 1 in 3 (34%)
Left-handed peopleMore than half (57%)

So being left-eye dominant isn’t rare, and neither is being right-handed and left-eyed.

Cross-dominance

You’re cross-dominant (also called mixed dominance) when your dominant eye is on the opposite side to your dominant hand: for example, right-handed and left-eye dominant. Eye dominance usually matches handedness, but often it doesn’t (AAO), and in the meta-analysis about a third of right-handers were left-eyed (Bourassa et al., 1996).

For everyday life it doesn’t matter. Where it can matter is in aiming sports such as golf, baseball and target shooting, and in photography, where lining up a shot with your non-dominant eye can misalign the image (AAO).

Can you change your dominant eye? There’s no reliable way to switch it. If you’re cross-dominant, there are adjustments you can make to compensate in aiming sports (AAO), and a coach can help with technique.

Why your dominant eye matters for eye surgery

For standard laser eye surgery, where both eyes are corrected for distance, your dominant eye makes little difference. It matters when the two eyes are deliberately set differently to reduce the need for reading glasses:

  • Monovision and blended vision. Your dominant eye is usually set for distance and the other eye for near (AAO; AAO). At Focus Vision, Laser Blended Vision is $4,250 per eye, the same as LASIK.
  • Micro-monovision with lens replacement. With extended depth of focus lenses, the non-dominant eye is set very slightly short-sighted to give a wide range of vision with minimal halos.

Because a home sighting test often doesn’t match the eye your brain prefers for focusing (Pepose et al., 2025), we don’t rely on it alone. Whenever we feel it will help you experience monovision before surgery, we arrange a contact lens trial, which is the most reliable way to find out which arrangement suits you (Evans, 2007).

Read more in monovision vs blended vision, Laser Blended Vision, and laser or lens replacement over 50.

Your dominant eye matters in one other area of eye care: in children with a lazy eye (amblyopia), the stronger, dominant eye is often patched so the weaker eye learns to work harder (AAO).

Thinking about reading glasses?

If you’re in your 40s or older and reaching for reading glasses, your dominant eye is one piece of the puzzle. Start with a free assessment with our optometrist, who checks your prescription and eye health, then talk through monovision, blended vision or lens options with Dr Brendan Cronin or Dr David Gunn.

Call (07) 3239 5005, email hello@focusvision.com.au or book online.

References

  1. Bourassa DC, McManus IC, Bryden MP. Handedness and eye-dominance: a meta-analysis of their relationship. Laterality. 1996;1(1):5-34. pubmed.ncbi.nlm.nih.gov/15513026
  2. American Academy of Ophthalmology. Eye Dominance. EyeSmart. 2022. aao.org/eye-health/tips-prevention/eye-dominance
  3. Pepose JS, Thompson V, Hoopes P, et al. Assessing Ocular Dominance: Rethinking the Current Paradigm. J Cataract Refract Surg. 2025;51(7):592-599. pubmed.ncbi.nlm.nih.gov/40135797
  4. Khan AZ, Crawford JD. Ocular dominance reverses as a function of horizontal gaze angle. Vision Res. 2001;41(14):1743-1748. pubmed.ncbi.nlm.nih.gov/11369037
  5. American Academy of Ophthalmology. What is monovision or blended vision? EyeSmart. aao.org
  6. Evans BJ. Monovision: a review. Ophthalmic Physiol Opt. 2007;27(5):417-439. pubmed.ncbi.nlm.nih.gov/17718882
B

Brendan Cronin

MBBS (Hons), DipOphthSci, B.Com, LLB, FRANZCO, FWCRS

Dr Brendan Cronin is a corneal, cataract and refractive surgeon and co-founder of Focus Vision in Brisbane. He is the Director of Education at the Queensland Eye Institute, completed his corneal fellowship at the Manchester Royal Eye Hospital in the UK, and teaches corneal and refractive surgery techniques to ophthalmologists internationally. He co-created the CAIRSPlan surgical planner and the free Focus Vision Refractive Outcomes Analyzer.

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