The Eye

Question 1

What are the 3 layers of the eyeball?

Answer 1

• Fibrous coat
• Vascular coat
• Sensory coat

Question 2

What are the components of the fibrous coat?

Answer 2

• Sclera

- Cornea

Question 3

What are the components of the vascular coat?

Answer 3

• Iris
• Ciliary body
• Choroid

Question 4

What structure means that the vascular coat is incomplete anteriorly?

Answer 4

Pupil

Question 5

Which layer receives a rich blood supply?

Answer 5

Vascular coat

Question 6

What is the main component of the sensory layer?

Answer 6

-Retina

Question 7

What does the retina contain?

Answer 7

Light sensitive rods and cones

Question 8

Where does the retina end anteriorly?

Answer 8

Serrated margin a little bit anterior to the equator known as the ora serrata

Question 9

What is the cornea?

Answer 9

The anterior 1/6 of the fibrous layer which is transparent and is a window to allow light rays to enter the eyeball

Question 10

What is the sclera?

Answer 10

The opaque posterior 5/6 of the fibrous coat which gives attachment to muscles moving the eyeball

Question 11

Why is the cornea transparent?

Answer 11

Due to the very regularly arranges collagen fibres

Question 12

What does the ciliary body do?

Answer 12

Suspends the lens and produces aqueous humor

Question 13

What does the choroid do?

Answer 13

Supplies blood to the outer layers of the retina

Question 14

What does the iris do?

Answer 14

Controls the diameter of the pupil and thereby control the amount of light rays entering the eyeball

Question 15

How many histological layers does the retina have?

Answer 15

10

Question 16

Zonules

Answer 16

Thin fibrous suspensory ligaments attaching the lens to the ciliary body

Question 17

What does the iris contain?

Answer 17

Radial and concentric muscles to help control the diameter of the pupil

Question 18

What is the crystalline lens?

Answer 18

A transparent, crystalline biconvex structure which is suspended by zonules from the ciliary body. It can change shape.

Question 19

How is the lens attached to the ciliary body?

Answer 19

By zonules at 360 degrees

Question 20

Anterior segment

Answer 20

Area in front of the crystalline lens

Question 21

Posterior segment

Answer 21

Area behind the crystalline lens

Question 22

What does the anterior segment contain?

Answer 22

Watery fluid called aqueous humor

Question 23

What does the posterior segment contain?

Answer 23

Transparent gel called vitreous humor

Question 24

What does the aqueous humor do?

Answer 24

Helps maintain intraocular pressure

Question 25

What does the vitreous humor do

Answer 25

Help cushion the retina by pushing it back

Question 26

What pressure is our eyeball maintained at?

Answer 26

21mmHg

Question 27

What happens in trauma when the vitreous humor becomes liquefied?

Answer 27

Increases the chance of retinal detachment

Question 28

Anterior chamber

Answer 28

Area of the anterior segment in front of the iris

Question 29

Posterior chamber

Answer 29

Area of the anterior segment behind the iris

Question 30

Describe the flow of aqueous humor.

Answer 30

• Produced by ciliary body
• Flows through posterior chamber
• Exits posterior chamber via pupil
• Drainage apparatus located at the angle of the anterior chamber

Question 31

Where is the angle of the anterior chamber found?

Answer 31

Between the cornea, sclera and iris

Question 32

What is the name of the drainage system of the aqueous humor?

Answer 32

Trabecular meshwork

Question 33

After it enters the trabecular meshwork, what happens to the aqueous humor?

Answer 33

It drains into the Schlemm’s canal then into episclera veins sitting on the sclera

Question 34

What structure can you see when you look through the aperture of the eyelids?

Answer 34

• Sclera
• Cornea (via reflection of light)
• Iris
• Pupil