What Percentage of People Have a Dominant Left Eye?

The Handedness Connection

There is a correlation between your dominant hand and your dominant eye, but it is not a perfect match.

Right-Handers - High correlation. About 67% of right-handed people are also right-eye dominant.

Left-Handers - Low correlation. Lefties are statistically more mixed. Only about 40% of left-handed people are left-eye dominant. The rest are actually right-eye dominant despite using their left hand for tasks.

Cross-Dominance (Mixed Laterality)

When your dominant eye is on the opposite side of your dominant hand (e.g., right-handed but left-eyed), this is called Cross-Dominance. While this can make aiming a firearm or camera awkward, it is often considered an athletic advantage in sports like baseball or cricket. A cross-dominant batter (right-handed, left-eyed) stands with their right shoulder back, meaning their dominant left eye is closer to the pitcher, allowing for better tracking of the incoming ball.

How to Test Yourself (The Miles Test)

You can determine your dominance in seconds using the "Triangle Test" (Miles Test):

1. Extend both arms fully in front of you.
2. Bring your hands together to form a small triangular hole between your thumbs and index fingers.
3. With both eyes open, center a distant object (like a doorknob or clock) in the triangle.
4. Close your Left Eye. If the object stays visible, your Right Eye is dominant.
5. Close your Right Eye. If the object jumps out of view or disappears, your Right Eye is dominant.

Why It Matters for Surgery (Monovision)

Knowing your dominant eye is critical for cataract surgery and LASIK. In a setup called Monovision, the surgeon corrects the dominant eye for distance (driving/TV) and the non-dominant eye for near (reading/phone). If the surgeon mistakenly corrects the non-dominant eye for distance, the brain often rejects the image, causing dizziness and disorientation because the "leader" eye is blurry.