Think you know all there is to know about the eyes? Take this quiz to test your knowledge. Which of these is a real thing an eye doctor might do to treat an eye disease? A. Give you very fashionable sunglasses Sadly, no. Sunglasses can help prevent cataracts, but they don’t treat eye diseases. There’s actually a procedure called a vitrectomy where an eye doctor sucks the fluid out of your eye with a tiny vacuum. No joke! It can treat eye conditions like retinal detachment and diabetic retinopathy. B. Challenge you to a staring contest No. That would be alarming! There’s actually a procedure called a vitrectomy where an eye doctor sucks the fluid out of your eye with a tiny vacuum. No joke! It can treat eye conditions like retinal detachment and diabetic retinopathy. C. Suck the fluid out of your eye with a tiny vacuum It’s true. This procedure, called a vitrectomy, can treat retinal detachment and diabetic retinopathy. How many times do you blink in a day? A. Almost 3,000 times Nope — way more than that. Blinking helps keep your eyes from getting dry. If you only blinked 3,000 times a day, you’d have some very dry eyeballs. The average person blinks 15 to 20 times every minute, or almost 30,000 times a day. B. Almost 30,000 times You got it! The average person blinks 15 to 20 times every minute, or almost 30,000 times a day. C. Almost 300,000 times Whoa. That would be a little too blinky. The average person blinks 15 to 20 times every minute, or almost 30,000 times a day. What's the point of eyelashes? A. They hold your contacts in Have you ever tried to remove a contact? They do a pretty good job sticking to your eye all by themselves. Eyelashes help keep stuff out of your eyes — so next time you get something in your eye, you’ll know who to blame. B. They keep dust and debris out of your eyes It’s true! Eyelashes help keep stuff out of your eyes — so next time you get something in your eye, you’ll know who to blame. C. They make winking more dramatic Well, sure. But that’s just a bonus! Eyelashes help keep stuff out of your eyes — so next time you get something in your eye, you’ll know who to blame. What do you call the cells in your eyes that respond to light? A. Rods and cones You got it! Rods are photoreceptors (light-sensitive cells) that help you see at night, and cones are photoreceptors that help you see colors. B. Balls and sticks No. But now’s a good time to remind you that when you play with balls and sticks, you need protective eyewear! The answer is actually rods and cones. Rods are photoreceptors (light-sensitive cells) that help you see at night, and cones are photoreceptors that help you see colors. C. Bits and bobs No. (Maybe in Britain.) It’s actually rods and cones. Rods are photoreceptors (light-sensitive cells) that help you see at night, and cones are photoreceptors that help you see colors. What’s nystagmus? A. The Greek god of vision Nope. That would be Theia, the Greek goddess of sight. Nystagmus means quick eye movements you can’t control— usually side to side, but sometimes up and down, or in circles. B. Quick side-to-side eye movements you can't control Yep! Nystagmus means quick eye movements that you can’t control — usually side to side, but sometimes up and down, or in circles. C. The crusty goop caused by eye infections Lovely! But no. Nystagmus means quick eye movements you can’t control — usually side to side, but sometimes up and down, or in circles. What is your blind spot? A. That space behind your car that the mirrors just don't reach Also that! But this is an eye quiz, folks. Your blind spot is the small part of your visual field where you can’t see anything. Your retina (the light-sensitive layer of tissue at the back of your eye) has a small area with no light-sensitive cells, where the optic nerve attaches. And that creates a small “blind spot” in your vision. B. That thing in your life — money? love? snacks? — that you just can’t think clearly about Okay that too! But save that chat for a heart-to-heart with your best friend — we’re here to talk about eyeballs. Your blind spot is the small part of your visual field where you can’t see anything. Your retina (the light-sensitive layer of tissue at the back of your eye) has a small area with no light-sensitive cells, where the optic nerve attaches. And that creates a small “blind spot” in your vision. C. The small part of your visual field where you can’t see anything Bingo! Your retina (the light-sensitive layer of tissue at the back of your eye) has a small area with no light-sensitive cells, where the optic nerve attaches. And that creates a small “blind spot” in your vision. Which of these is an actual part of the eye? A. The canal of Schlemm Indeed. But so are all the others! And in case you’re wondering, the canal of Schlemm is a set of small tubes that helps fluid drain out of your eye. B. The lacrimal caruncle Yes. It’s real. But so are all the others! And FYI, the lacrimal caruncle is the little pink triangle at the inner corner of your eye. C. The trabecular meshwork It is. But so are all the others! And to save you the google search, the trabecular meshwork is spongy tissue that helps fluid drain out of your eye through — wait for it — the canal of Schlemm! D. The zonule of Zinn Yep. No joke. But so are all the others! And just so you know, the zonule of Zinn is a little band of fibers that attaches a muscle to your eye’s lens (clear inner part of the eye that helps the eye focus). E. All of the above Yep. We swear, these are all real. Happy googling!