How much do you know about your eyes?

woman's eye through a magnifying glass
Photo: gurinaleksandr/Shutterstock

They help you see the world, but how much do you really know about the windows to your soul? Test your knowledge.

Question 1 of 15

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baby with blue eyes
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All babies are born with blue eyes.

Yes, all babies are all born with blue or gray eyes. Eyes can stay that color or turn brown or green. You'll get a pretty good idea of your baby's final eye color by the time he or she turns 6 months old.

Question 2 of 15

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man covering one eye
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Eye twitches are usually a sign of something serious.

Those twitches, tics and spasms are pretty common and rarely are a sign of a major medical problem. They can be caused by stress or tiredness, eye strain or dry eyes, caffeine, allergies or nutritional imbalances. See your eye doctor if twitching just doesn't seem to go away.

Question 3 of 15

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color blindness test
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Who is more likely to be color-blind?

About 8 percent of men have problems seeing certain colors, while only 1 percent of women have the same issue. Most people with color blindness have trouble distinguishing red and green. More rarely, color-blind people may have issues seeing blue and yellow. The condition is often inherited but can also be caused by cataracts or certain illnesses such as Parkinson's disease.

Question 4 of 15

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dragon toy with crossed eyes
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If you cross your eyes they can really get stuck that way.

Mom was just trying to get you to stop making faces. No matter how far you cross your eyes or how goofy you look, your eyes aren't going to get stuck.

Question 5 of 15

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pirate wearing an eye patch
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How long does an eye take to repair itself from a corneal scratch?

If you've ever had a scratch on your cornea — from an injury or a trapped piece of dust or sand — the pain can be really intense. The good news is that with the right care, usually prescription eye drops and rest, your eye should heal in one to three days.

Question 6 of 15

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pinkeye, irritated red eye
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Pinkeye is always extremely contagious.

Officially called conjunctivitis, pinkeye can be caused by a virus, bacteria or allergies. Viral pinkeye can be spread just by coughing or sneezing, and bacterial pinkeye can be spread by direct contact with hands or something that has touched the infected eye. But you can't catch or spread red, itchy eyes caused by allergies.

Question 7 of 15

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inside a healthy retina
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How many rods and cones are in your eyes?

Rods and cones are special cells that your retina uses to process light. Rods see in black and white and shades of gray. Cones see color. We have about 120 million rods and 7 million cones in each eye.

Question 8 of 15

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mom and toddler girl both wearing glasses
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If one or both of your parents wears glasses, chance are you'll wear them too.

Two of the most common eye conditions — nearsightedness (myopia) and farsightedness (hyperopia) — are usually inherited. So if your mom or dad had one or the other, chances are you'll need glasses or contacts, too. People who are nearsighted have trouble seeing things far away, but they can see things up close clearly. People who are farsighted have difficulty seeing things close up.

Question 9 of 15

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tree frog blinks
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How many times do we blink every minute?

We blink to lubricate our eyes and to protect them from debris, but scientists say perhaps we also blink so often to help us take a break and focus our attention.

Question 10 of 15

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drawing of many generations
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When does nearsightedness often become worse?

Nearsightedness is often discovered in kids between ages 8 and 12. It tends to get worse during the teen years as kids have growth spurts. There's typically little change between 20 and 40.

Question 11 of 15

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blue-eyed baby with parents in the background
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Two parents with brown eyes can have a child with blue eyes.

It was once thought that brown eyes were always a dominant eye color trait. But now researchers know that eye color is controlled by several genes. That's why two brown-eyed parents can have a blue-eyed child and why parents with blue or green eyes can have a child with brown.

Question 12 of 15

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looking through a dirty windshield
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How are cataracts treated?

People often say having a cataract is like looking through a dirty car windshield. Cataracts are one of the most common causes of vision loss. By age 80, more than half of Americans have a cataract or have had surgery for one. Cataracts are part of the normal aging process so no drops or drugs can make them go away. Only surgery can remove them.

Question 13 of 15

Score: 0

carrots
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Carrots improve your vision.

Carrots are a fine source of vitamin A which is important for your overall eye health, but eating them won't help you see better. According to the rumor-busters at Snopes.com, during World War II the British military told the story that carrots helped their pilots see Nazi bombers at night. They spread the tale because they didn't want their enemies to find out they really had super-secret radar.

Question 14 of 15

Score: 0

pug dog blinking one eye
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Sometimes we forget to blink.

Although it is a natural reflex, blinking can be forgotten, especially when we spend a lot of time in front of the computer or when we focus on just one thing. Your eyes can get tired and dry, so eye experts suggest the 20-20-20 rule: Every 20 minutes, look at something about 20 feet in front of you for 20 seconds. This can help ease eyestrain.

Question 15 of 15

Score: 0

man asleep at his computer
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It's usually OK to sleep in your contacts.

When you sleep in your lenses, you're depriving your corneas of the oxygen they need to stay healthy. Wearing contacts overnight increases the chances of a corneal infection. Even extended wear lenses aren't safe for overnight use. To be safe, always take your lenses out before you doze.

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woman's eye through a magnifying glass
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