The structure of eyes
Structure of eyes
|
Function
|
Suspensory ligament
|
- holds the lens in its position
|
Ciliary muscles (ciliary body)
|
- change the thickness of the lens
|
Iris
|
- controls the amount of light entering the eye
|
Pupil
|
- the central opening formed by the iris
- allows light rays to enter the eye |
Cornea
|
- helps to focus light rays onto the retina
|
Aqueous humour
|
- a transparent liquid which fills the space between the
lens and the cornea - maintains the shape of the eye and helps to refract light rays |
Lens
|
- bends and focuses light rays onto the retina
|
Blind spot
|
- the region of the retina that lacks receptors
- the part of the retina that is not sensitive to light |
Choroid
|
- contains a lot of blood vessels and black pigments
- blood vessels provide nutrients and oxygen to the eye - the black pigments absorb light and prevent reflection of light in the eye |
Optic nerve
|
- connects the retina to the brain
- sends impulses from the retina to the brain for processing |
Fovea (yellow spot)
|
- the part of retina that is most sensitive towards light
|
Retina
|
- formed by millions of light-sensitive cells
- responds to light rays - enables image formation - sends impulses to the brain using the optic nerve |
Sclera
|
- protects and maintains the shape of the eye
|
Vitreous humour
|
- a transparent jelly-like substance which fills the
space between the lens and the retina - maintains the shape of the eye and helps to refract light rays |
Reason of blinking:
Video with task: How to take care our eyes
After watching the video, discuss with your friend and list out 5 ways on how to take care our eyes.
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