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I Can See Clearly Now Trivia Quiz

Nearly all of us have them, and they come in all shapes, colours and sizes - but how much do you really know about the human eye? Let's have a look - no pun intended!

A multiple-choice quiz by crazy baby. Estimated time: 4 mins.

Author
crazy baby

Time
4 mins

Type
Multiple Choice

Quiz #
351,000

Updated
Jul 23 22

# Qns
10

Difficulty
Average

Avg Score
7 / 10

Plays
566

One at a Time - Single Page - Timed Game

Question 1 of 10

1. Let's start with some eye anatomy. In order for us to be able to see, light waves must enter the eye, first entering through the clear, domed top layer of the eye. What is this domed surface called?

HINT: It is quite common to donate or receive this part of the eye for transplantation. Hint

Iris

Cornea

Pupil

Fovea

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Question 2 of 10

2. And what about the coloured part of the eye? What is that called? Hint

Lens

Iris

Pupil

Retina

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Question 3 of 10

3. We all produce tears from our tear ducts, regardless of whether or not we have something to cry about! Of the following options, which is NOT a physiological reason for tear production? Hint

To act as a supply of oxygen to the cornea

Preventing the cornea from becoming damaged from dryness

To stop the eyes becoming sticky with gunk

To flush away harmful bacteria and microbes

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Question 4 of 10

4. If a person has 'heterochromia irides', how are their eyes affected? Hint

They are colourblind

The eyes are different shapes

The eyes are different colours

The eyes are different sizes

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Question 5 of 10

5. It is more common for boys to be colourblind than girls.

True

False

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Question 6 of 10

6. It is said that the eyes are the window to the soul, but they are also the window to a lot more! There are many illnesses and diseases that are not related to the eye directly, but may still affect the eye and cause changes within it. If an eye specialist were to look in to a person's eyes, which of the following diseases could they NOT find evidence of? Hint

Genital warts

High cholesterol (Hypercholesterolaemia)

Low blood pressure (Hypotension)

Diabetes

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Question 7 of 10

7. Two different types of cell in the back of the eye allows us to detect colours and shades of light and darkness. The cells responsible for seeing light contrast are called 'rods'. What are the cells that detect colour called?

Answer: (One Word, plural)

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Question 8 of 10

8. Eating carrots can help you to see in the dark.

True

False

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Question 9 of 10

9. As well as damaging your body in other ways, smoking cigarettes also affects the eyes. Which of the following eye illnesses would you not expect to occur as a result of smoking? Hint

Optic neuropathy

Cataracts

They can all be caused by smoking

Macular degeneration

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Question 10 of 10

10. Although eye surgery and medicine are improving all the time, we still only have two eyes each and need to take care of them! From the options below, what would not be recommended as a step to keep our eyes healthy? Hint

Rest your eyes frequently

Eating a good diet

Wearing other people's glasses

Protecting your eyes from ultraviolet light

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Quiz Answer Key and Fun Facts

1. Let's start with some eye anatomy. In order for us to be able to see, light waves must enter the eye, first entering through the clear, domed top layer of the eye. What is this domed surface called? HINT: It is quite common to donate or receive this part of the eye for transplantation.

Answer: Cornea

The cornea is the most powerful light-focussing structure in the human eye. It is transparent as there are no blood vessels within it, and very few cells. The cornea contains the most nerves in any human body structure, making it extremely sensitive to pain.

2. And what about the coloured part of the eye? What is that called?

Answer: Iris

The colour of human eyes is determined genetically, though you may not necessarily have the same colour eyes as your parents! Melanin and lipochrome are the two pigments responsible for eye colour, each controlled by a separate gene.

3. We all produce tears from our tear ducts, regardless of whether or not we have something to cry about! Of the following options, which is NOT a physiological reason for tear production?

Answer: To stop the eyes becoming sticky with gunk

Tears are also produced to smoothen the (slightly) irregular surface of the cornea, and to destroy any bacteria with enzymes contained in the tear fluid. No-one really knows why our eyes produce tears when we are sad.

4. If a person has 'heterochromia irides', how are their eyes affected?

Answer: The eyes are different colours

One of the most famous people with heterochromia irides is David Bowie, the UK rock icon. This occurs as a result of genetics, as eyes do not change colour of their own accord!

5. It is more common for boys to be colourblind than girls.

Answer: True

Colour blindness affects around one in 20 men and 1 in 200 women, and is a hereditary condition. It affects more males than females as the faulty gene which causes colour blindness is carried on the X chromosome. Women would need two faulty X chromosomes to exhibit colour blindness, or one to be a carrier, whereas men only have one X chromosome - if it carries the faulty gene, the man will be colourblind.

Answer: Low blood pressure (Hypotension)

It is quite common for a person with high cholesterol to develop a creamy-coloured ring around the edge of the iris, especially into old age. Whilst diabetes is primarily a disease of the hormonal system, the effects are far reaching and may develop into retinopathy (inflammation of the retina). And yes, sexually transmitted infections (including genital warts) can be transmitted to the eye through contact with the infection! Low blood pressure does not produce any visible effects on the eye, although high blood pressure can damage the retina.

Answer: cones

Rods and cones are so called simply because they are shaped like rods and cones. We use our rods to see in very dim light, though things don't appear colourful as the colour-detecting cones only work in brighter light.

8. Eating carrots can help you to see in the dark.

Answer: True

A common topic of debate! Carrots are high in Vitamin A, which is converted to a substance called retinene in the body. Retinene makes up part of the photopigments found on your retina, which detects light. The more photopigments you have, the better your eyes will be at detecting light.

So yes, carrots can help you see better in the dark (unless you otherwise receive enough Vitamin A), but they do not help with any other eye condition or improve eyesight generally.

9. As well as damaging your body in other ways, smoking cigarettes also affects the eyes. Which of the following eye illnesses would you not expect to occur as a result of smoking?

Answer: They can all be caused by smoking

Smokers have a higher chance of developing any of these eye conditions than non-smokers. People with thyroid problems who also smoke are at a higher risk of developing thyroid eye disease, too.

Answer: Wearing other people's glasses

Ok, so it's a little obvious, but people do it anyway: wearing glasses prescribed for other people is not a good idea. However, eating well, wearing sunglasses in bright sunshine, and not staring at a television or computer screen for too long are all things we should do to protect our precious vision.

Source: Author crazy baby

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