Welcome to the Quiz!
This quiz contains 14 questions from a mix of 1 subtopics.
Which two structures refract (bend) light entering the eye?
Cornea
Lens
Pupil
Iris
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When light passes into the eye, where on the retina should the light be focused?
The fovea
The vitreous fluid
The sclera
The optic nerve
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When looking at a nearby object, the light from the object hits the eye at a wide angle. This means that the eye needs to refract the light strongly.
To achieve this, what should the shape of lens be?
Cuboidal
Long and thin
Short and fat
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The diagram above shows a side-on and front-on view of the lens and it's surrounding structures.
What is the structure labelled X?
Lens
Suspensory ligament
Ciliary muscle
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The diagram above shows a side-on cross-sectional view of the lens and it's surrounding structures.
What is the structure labelled X?
Ciliary muscle
Suspensory ligament
Lens
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True or false? The ciliary muscle is just like any other muscle, so it can contract or relax.
True
False
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The suspensory ligament is not a muscle, it is a ligament.
Can it contract and relax?
Yes
No
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When looking at a nearby object, the lens must be short and wide to refract the light strongly and focus the light on the retina.
How do the ciliary muscle and suspensory ligaments achieve this?
(Select all that apply)
The ciliary muscle contracts
The ciliary muscle relaxes
The suspensory ligaments are pulled taut
The suspensory ligaments slacken
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The ciliary muscle is a circle band of muscle that encircles the suspensory ligaments and the lens.
Which of the images above, A or B, show the ciliary muscle in its contracted state?
A
B
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What happens to the ciliary muscle, suspensory ligaments, and the lens, when the eye focuses on a distant object?
(Select all that apply)
The ciliary muscle contracts
Lens is pulled tall and thin
Lens is short and wide
The ciliary muscle relaxes
The suspensory ligaments slacken
The suspensory ligaments are pulled taut
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What does long-sighted mean?
The eye is unable to focus on nearby objects
The eye is unable to focus on distant objects
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One solution to long-sightedness is to wear glasses.
Which type of lens would the glasses need to contain?
Convex lens
Concave lens
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If somebody cannot focus on distant objects, are they long-sighted or short-sighted?
Long-sighted
Short-sighted
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One solution to short-sightedness is to wear glasses.
Which type of lens would the glasses need to contain to correct short-sightedness?
Convex lens
Concave lens
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