Dominant Eye Test
Find your dominant eye in under a minute with the hand-triangle (Miles/Porta) method.
Just as most people prefer one hand, most people have a dominant eye whose input the brain favours slightly when aiming or lining things up. Eye dominance (ocular dominance) is not the same as having the better-seeing eye, and it does not always match your dominant hand. Roughly two thirds of people are right-eye dominant, and a small number show no clear preference.
This tool guides you through the Miles test and the related Porta test, the two classic sighting methods. You make a small triangle with your hands, frame a distant object with both eyes open, then close each eye in turn or bring your hands towards your face. The eye that keeps the object in the triangle, or the eye your hands drift towards, is your dominant one. The tool asks you a few questions about what you saw and shows the result.
Knowing your dominant eye is practical. It helps you choose which eye to use for shooting, archery, darts or a camera viewfinder, and it is relevant when an eye specialist plans monovision contact lenses or refractive or cataract surgery, where one eye is set for distance and the other for near. It is a harmless, fun test, but it is not a vision test and says nothing about the health of your eyes.
How to use
- Choose a small object at least 3-6 metres away, such as a light switch, door handle or clock.
- Stretch your arms out and overlap your hands to make a small triangular opening.
- With both eyes open, centre the object inside the triangle.
- Close your left eye: if the object stays in the triangle, your right eye is likely dominant.
- Open both eyes, then close your right eye and check again.
- For confirmation, keep both eyes open and slowly bring your hands to your face; they will naturally come to the dominant eye.
- Enter your observations in the tool and repeat once or twice to make sure the result is consistent.
Reading your result
The eye that kept the object in view, or towards which your hands moved, is your dominant eye. If the results varied between attempts, you may have mixed or weak dominance, which is also normal.
For aiming sports, many coaches suggest shooting from the side of the dominant eye; if your dominant eye is on the opposite side to your dominant hand (cross-dominance), a coach can help you adapt. Eye dominance on its own is not a cause for concern. However, if one eye sees clearly worse than the other, if you often close one eye in bright light or for reading, or if an eye turns in or out, have an eye examination, because these can be signs of strabismus or amblyopia.
Caution: This is a sighting preference test, not a medical test. It does not assess vision or eye health. Double vision or an eye that drifts should be checked by an eye-care professional.
Frequently asked questions
Does my dominant eye see better?
Not necessarily. Dominance is about which eye the brain prefers for aiming, not which eye is sharper. Your non-dominant eye can even have better acuity.
Can eye dominance change?
It is generally stable, but it can shift after a change in vision in one eye, such as cataract or a large prescription difference.
Why does it matter for photography?
Using the dominant eye at the viewfinder usually feels more natural and makes framing more accurate, while the other eye can stay open for awareness.