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The Human Eye Trivia Quiz

If you're here, you've been using your eyes. But how much do you know about these interesting organs?

A multiple-choice quiz by malik24. Estimated time: 5 mins.

Author
malik24

Time
5 mins

Type
Multiple Choice

Quiz #
273,060

Updated
Dec 03 21

# Qns
10

Difficulty
Tough

Avg Score
6 / 10

Plays
2276

Awards
Top 20% Quiz

One at a Time - Single Page - Timed Game

Question 1 of 10

1. Which eye disorder causes an opacity in the lens, which if left uncured, may blind you? Hint

Cataracts

Exotropia

Glaucoma

Myopia

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Question 2 of 10

2. Which of these sentences most accurately describes the function of the eyelid?
Hint

Rests the eye, ensuring it does not get too tired

Wipes the eyes, and prevents dehydration

Focuses the eye, by maintaining its pressure

Allows blood flow throughout the eye

NEXT>

Question 3 of 10

3. Which sentence is untrue about the function of the eyebrow?
Hint

Defines the face, helping express various emotions

May catch falling particles before they reach the eye

None of these are untrue

Redirects flowing substances away from the eye

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Question 4 of 10

4. I'm outside in the blazing sun. It is shining heavily. For some reason, there's a mirror on a wall. I look inside it, what do I notice about my eyes?
Hint

The irises are very small

They are burning

The pupils have dilated

The pupils are very small

NEXT>

Question 5 of 10

5. When reading a book, your lenses need to adjust to focus the light that enters the eye. Which of these statements is true as to how the lenses have adjusted by the ciliary muscles? Hint

Lenses are squeezed and contracted - they become stronger and rounder

Lenses are relaxed - they become stronger and flatter

Lenses are relaxed - they become weaker and rounder

Lenses are squeezed and contracted - they become stronger and flatter

NEXT>

Question 6 of 10

6. There are 5 areas of the visual cortex, known as V1, V2 etc. Which area primarily deals with interpreting motion?
Hint

7. Which of these is located between the cornea and lens, maintains the convex shape of the cornea with its pressure, provides nutrition for ocular tissues, and carries away the waste from said tissues? Hint

Vitreous Humour

Conjunctiva

Sclera

Aqueous Humour

NEXT>

Question 8 of 10

8. Given that in rods, the photochemical that breaks down and then sends an impulse up the optic nerve is called rhodopsin, which chemical do cones contain for the same purpose?

Hint

Iodopsin

Brodopsin

Rhodopsin

Flourodopsin

NEXT>

Question 9 of 10

9. In front of the photosensitive cells are two other types of cells. But which are the ones the light would hit first?
Hint

Ganglion Cells

Bipolar Cells

Opticaric Cells

Idicary Cells

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Question 10 of 10

10. The ganglion cells and bipolar cells are in front of the rods and cones, and are all in the retina - but can you put them in order of quantity (greatest - smallest)?

Hint

Bipolar cells - Ganglion cells - Rods + Cones

Ganglion cells - Rods + Cones - Bipolar cells

Rods + Cones - Bipolar cells - Ganglion cells

Ganglion cells - Bipolar cells - Rods + Cones

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Quiz Answer Key and Fun Facts

1. Which eye disorder causes an opacity in the lens, which if left uncured, may blind you?

Answer: Cataracts

Yes, these are cataracts. You often hear about old people getting them, but these days, treatment is easy for them. There are also many types of cataract, and the most popular is to simply replace the opaque lens with another.

2. Which of these sentences most accurately describes the function of the eyelid?

Answer: Wipes the eyes, and prevents dehydration

The eyelids wipe the eyes clean of any buildup of particles/dust/bacteria etc, and prevent dehydration in them. We have to blink a lot to keep our eyes in good condition.

3. Which sentence is untrue about the function of the eyebrow?

Answer: None of these are untrue

They are all correct. When surprised or angry, for instance, your eyebrows can play a part in showing such emotions. Although catching debris is a secondary function, it still does it. They act a bit like a rooftop for flowing substances (like rain) and stop them getting into the eye and blurring them.

4. I'm outside in the blazing sun. It is shining heavily. For some reason, there's a mirror on a wall. I look inside it, what do I notice about my eyes?

Answer: The pupils are very small

Well, my eyes certainly weren't burning at the time!
In fact, the iris (colored part of the eye which is a muscle) has contracted. The pupil is very small because of this - that's the hole which allows light in. If your iris didn't contract, the amount of light that would go in would be painful.

5. When reading a book, your lenses need to adjust to focus the light that enters the eye. Which of these statements is true as to how the lenses have adjusted by the ciliary muscles?

Answer: Lenses are squeezed and contracted - they become stronger and rounder

The lenses need to be strong and curved, as objects in a short distance require the most refraction of incoming light to focus them onto one point. When the ciliary muscles contract the suspensory ligaments are less taut, and the lenses are made stronger and rounder. The process where the eye adjusts the lens shape is called accomodation.

6. There are 5 areas of the visual cortex, known as V1, V2 etc. Which area primarily deals with interpreting motion?

Answer: V5

V5 deals with motion. Someone with a damaged V5 area may not be able to see moving objects until they stopped moving(as an example). These visual areas are still slightly mysterious, and not everything is known about them: it takes someone getting damage in an area to potentially find out more with brain scans.

Answer: Aqueous Humour

The aqueous humour does exactly that, its main function to keep the cornea in its convex shape. It's still see-through, though, so that light can get in.

8. Given that in rods, the photochemical that breaks down and then sends an impulse up the optic nerve is called rhodopsin, which chemical do cones contain for the same purpose?

Answer: Iodopsin

The chemical is iodopsin, which requires more light to break it down than the rhodopsin of rods. Once broken down an impulse is sent through other cells in the retina before being sent up the optic nerve to be processed in higher brain areas. It's for that reason that when there's little light in the environment, we find it hard to see in colour.

9. In front of the photosensitive cells are two other types of cells. But which are the ones the light would hit first?

Answer: Ganglion Cells

Ganglion cells are at the front - light would hit these first. Bipolar cells sit just behind them. Both are transparent and let light through. The bipolar cells transmit electrical impulses to the ganglion cells. The ganglion cells lead on to the lateral geniculate nucleus in the brain, where the information is finally sent to the PVC (primary visual cortex) for processing.

Not everything is known yet about this processing... it takes someone with a faulty PVC to find out more.

10. The ganglion cells and bipolar cells are in front of the rods and cones, and are all in the retina - but can you put them in order of quantity (greatest - smallest)?

Answer: Rods + Cones - Bipolar cells - Ganglion cells

There are many millions of rods and cones (roughly 126 million in total). There are less bipolar cells, and less ganglion cells overall. Although in the fovea ganglion cells are more concentrated there are far fewer outside that. As there are fewer ganglion cells the information is passed through them and then to the optic nerve.

Thanks for playing the quiz!

Source: Author malik24

This quiz was reviewed by FunTrivia editor crisw before going online.
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