Unit4- 6.1~ Structure of the eye Flashcards
1
Q
What components are in the eye?
A
- pupil
- iris
- tear glands
- humours/fluids
- conjunctiva
- cornea
- retina
- macula
- optic nerve
- ciliary muscle/suspensory ligaments
- lens
2
Q
What is the role of the pupil?
A
- Is the circular opening in the centre of the iris
- Light passes into the lens of the eye
3
Q
What is the role of the iris?
A
- Regulates the amount of light that enters the eye
- It forms the coloured, visible part of the eye, in front of the lens
4
Q
What is the role of the tear glands?
A
- Lacrimal gland produces aqueous layer of the eyes tear film
- The aqueous layer is made up of water, proteins, vitamins, electrolytes
- Helps lubricate the eye, wash debris
5
Q
What is the role of the humours?
A
- The aqueous humor bathes and nourishes the lens and maintains pressure within the eye
- Helps the eye keep its shape
6
Q
What is the role of the conjunctiva?
A
- The conjunctiva provides protection and lubricates the eye by the prodection of mucus and tears
- Prevents microbial entrance into the eye & plays a role in immune surveillance
- Lines the inside of the eyelids
7
Q
What is the role of the cornea?
A
- The transparent/clear circular part of the front of the eyeball
- It refract the light entering the eye onto the lens
- Extremely sensitive to pain
8
Q
What is the role of the retina?
A
- A light sensitive layer that lines the interior of the eye
- It composed of light sensitive cells known as rods and cones
9
Q
What is the role of the macula?
A
- Is part of the retina at the back of the eye
- Only 5mm but is responsible for our central vision, most colour and fine detail we see.
10
Q
What is the role of the optic nerve?
A
Leaves the eye at an optic disc and transfers all visual information to the brain
11
Q
What is the role of the ciliary muscle/suspensory ligaments?
A
- Ciliary muscles help in changing shape of the lens to focus on the near object
- It also controls the flow aqueous humour
12
Q
What is the role of the lens?
A
- A transparent structure situated behind the pupil
- It is enclosed in a thin transparent capsule and helps to refract incoming light and focus on the retina
