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11 Impossibly Cool Facts You May Not Know About Your Eyes

Your eyes are rad. Enhance their beauty (in the subtlest of ways) with a little help from 1-DAY ACUVUE® DEFINE™ Brand Contact Lenses. Click for Important Safety Information.

1. The eye muscle is the fastest reacting muscle in your entire body — it contracts in less than 1/100th of a second!


The eye muscles all constantly work together so you can blink, focus, and track movement, such as your cute neighbor riding his bike. ;)

2. The first eyes ever to exist were likely a couple of eyespots only able to distinguish between light and dark.


Eventually, as creatures evolved, eyes were able to focus! A ton of changes took place to make the eye the complex organ it is today.

3. If you had been born with different-colored eyes, you'd be completely heterochromatic.


There are different degrees of heterochromia, and it's more common in animals (like dogs).

4. There are approximately seven million cones and 130 million rods in your retina that respond to light.


The former allow you to see color and detail while the latter help you tell white from black! These cells are referred to as photoreceptors.

5. Around 6,000 to 10,000 years ago, everybody had brown eyes, and then the first blue-eyed person was born.


Can you imagine what his or her parents thought? Oh, and all blue-eyed people in the world are related, according to science.

6. Your eyes can see around 10 million different colors...

Via Shutterstock

Isn't that awesome? It's too bad dogs can't enjoy this incredible gamut of pigments.

7. ...but if you were part of that 1% of women with a rare genetic mutation, you'd be able to see 100 million colors.

Via Shutterstock

You'd be tetrachromatic and probably incredibly fun to talk to.

8. Your whole family — and your significant other's — may consist of brown-eyed people, yet you could still have a blue-eyed baby.

Via Shutterstock

It's all about genetics.

9. Your eye color doesn't set until you turn two.


Have you noticed babies are always born with a bluish eye color? Well, blame it on the amount of melanin.

10. Feel free to reward your eyes with a trip to a beautiful rose garden, because your eye muscles are always working, like, really, really hard.

Via Shutterstock

That's right: Eyeing your co-worker's sandwich from across the desk takes a ton of coordination for your eyes, and you don't even know it. Here's a quick run-through of how awesome your ocular muscles are.

11. According to studies, defined limbal rings can make you appear more attractive.

Apple Color / Shutterstock

The limbal ring is the dark, round line around your iris and, apparently, you're more likely to develop a crush on someone who shows them prominently.

Oh, and super-fun fact? 1-DAY ACUVUE® DEFINE™ Brand Contact Lenses provide a defining outline around your iris to amplify contrast — for beautiful eyes that pop!

Important information for contact lens wearers: 1-DAY ACUVUE® DEFINE™ Brand Contact Lenses are available with and without vision correction. An eye care professional will determine whether contact lenses are right for you. Although rare, serious eye problems can develop while wearing contact lenses. To help avoid these problems, follow the wear and replacement schedule and the lens care instructions provided by your eye doctor. Do not wear contact lenses if you have an eye infection, or experience eye discomfort, excessive tearing, vision changes, redness or other eye problems. If one of these conditions occurs, remove the lens and contact your eye doctor immediately. You should never share your lenses with anyone else. For more information on proper wear, care and safety, talk to your eye care professional and ask for a Patient Instruction Guide, call 1-800-843-2020 or visit