For the next week, in Science, we are learning about the eye, how it functions, what type of parts they have and how it gives us vision. Next Thursday we will dissect a cows eye, not quite excited about that but I want to know what the parts look like in person.
Parts of the eye
There are 7 main parts to the eye. But we will be looking at the front of the eye first.
Cornea: The protective outer layer – covers and protects from getting dust in the eye.
Pupil: Where the light enters the eye – Only passing through/entering it and it’s a black hole.
Iris: Controls how much light enters – The colour bit of the eye, a muscle that can be bigger or smaller.
Lens: Focuses light onto the retina – Direct and focus the light where it’s needed.
Next is the back part of the eye.
Retina: Converts light to electrical impulses – part of the back of the eye converts the light to electrical impulses.
Optic Nerve: Carries the electric impulses to the brain – takes the electrical impulses from the retina to the brain to create images.
Humorous (Vitreous humour): The liquid or flui5d mush in the middle gives the eye its shape – it fills the eyeball to give its round shape, without it the eyeball will be small
True or False
- Our eye sees an object because it sees the light that bounces (reflects) off the object: True
- Our eyes do all the work when seeing things: False (Need the brain to see)
- The image the eye sends to a brain exactly how we see it in real life: False (It’s upside down and the brain flips it)
Final Question: What does the brain have to do with the image sent from the eye? Both our brain and eyes work together so they help us see more clearly and have details on what we see. The brain mostly creates images and objects then the eye sees them.
What happens to the pupil in bright light? The pupil turns small.
What about dim light? The pupil turns big.
Why? For dim light, the pupil turns big to allow more light to enter your eye to see. For bright light, the pupil turns small because it won’t allow the light to enter through the pupil and that’s because there too much light entering.