1. Revision of content and practise questions
The eye
Revision of content and practise questions

2. Objectives
To be able to recall and label the features of the human eye (knowledge and synthesis)
To be able to link our work on lenses to the function of the eye (applications)
To be able to describe what is meant by long and short sightedness (comprehension)
To be able to explain how lenses can be used to correct long and short sightedness (comprehension)

3. A quick recap…

4. Collaborative challenge time
Your task is to make a 2D model eye.
It should have different layers and colours, to differentiate the separate parts.
It may have 3D elements.
You must include the features appropriate for your group grade
You have 10 minutes [a help sheet is available if very stuck!]
Materials
Pens
Paper
Scissors
glue
A/A*
Retina
Ciliary muscles
Pupil
Cornea
Eye lens
Iris
Optic nerve
Eye muscles
Aqueous humour
Vitreous humour B
Retina
Ciliary muscles
Pupil
Cornea
Eye lens
Iris
Optic nerve
Eye muscles C
Retina
Ciliary muscles
Pupil
Cornea
Eye lens
Iris
You will need to remember to add a description of what each feature does!

5. Let’s have a look at each others…..
Now you’ve seen some other group’s work, have another look at your own.
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6. Come around the front desk Far point and near point
Near point = 25cm
Far point = infinity

7. Short and long sightedness
Short sighted
Long sighted
The eye is too long
The image doesn’t focus far enough into the eye to hit retina
Use a diverging lens to correct
The eye is too short
The image focuses to late/to far through eye
Use converging lens to correct

8. Why does the pupil appear much wider in darkness than in daylight?
A person reading a book looks up at a distant object. Explain what happens to the eye lens and why
Explain what short sightedness is, and what you need to do to correct it. Explain why it works
Explain what long sightedness is, and what you need to do to correct it. Explain why it works
Explain what long sightedness is, and what you need to do to correct it. Explain why it works
A student is unable to see a plate on a car 15m away with his left eye (which has a normal nearpoint). Is he long or short sited? Explain why.
Why does the pupil appear much wider in darkness than in daylight?
Why does the pupil appear much wider in darkness than in daylight?

9. Key points to learn!

10. Objectives Review What progress have you made towards the objectives?
To be able to recall and label the features of the human eye (knowledge and synthesis)
To be able to link our work on lenses to the function of the eye (applications)
To be able to describe what is meant by long and short sightedness (comprehension)
To be able to explain how lenses can be used to correct long and short sightedness (comprehension)
What progress have you made towards the objectives?
Are you more confident with ‘the eye’ work now?
What are your main areas for development now?