How do we see? (Group Work)

 

How do we see?

Your eyes are at work from the moment you wake up to the moment you close them to go to sleep. They take in tons of information about the world around you — shapes, colors, movements, and more. 

Then they send the information to your brain for processing so the brain knows what's going on outside of your body.

  

The eye is about as big as a ping-pong ball and sits in a little hollow area (the eye socket) in the skull. 

The Eyelid

The eyelid protects the front part of the eye.

 The lid helps keep the eye clean and moist by opening and shutting several times a minute. 

This is called blinking, and it's both a voluntary and involuntary action, meaning you can blink whenever you want to, but it also happens without you even thinking about it.

Eyelashes

They work with the eyelids to keep dirt, dust and other unwanted stuff out of your eyes.

The Iris

The Iris is the colourful part of the eye.

The Pupil

The pupil is the black circle in the center of the iris, which is really an opening in the iris. 

It lets light enter the eye. 

The pupils will get smaller when the light shines near them and they'll open wider when the light is gone.

Questions

1. What is the average size of your eye?

2. What is the name of the area in the skull which holds the eye?

3. Explain the difference between voluntary and involuntary blinking.

4. Why are eyelids important?

5. What is the name of the coloured part of your eye?

6. What does the pupil do?