1. Eye Defects - Lens- -Retina- By Daniel Drummond Graeme Paterson Conor McHugh

2. Activity 1 – Aim: To find out where the light is focused in a normal eye ₪ Demonstration ₪Explanation

3. Activity 2 – Aim: To find out where light is focused in a short-sighted eye and find out how to correct this defect ₪ Demonstration ₪Explanation

4. Activity 3 – Aim: To find out where light is focused in a long-sighted eye and to find out how to correct this defect ₪ Demonstration ₪Explanation

5. You Should Now Know: That short-sighted people can see close objects but far away objects are blurred That long-sighted people can see far away objects but close objects are blurred

6. You Should Also Know: That in short-sighted eyes, the light rays are focussed to a point before they get to the retina That in long-sighted eyes, the light rays are not focussed to a point by the time they reach the retina and the focus would be behind the retina

7. You Should Also Know: That concave lenses are used to correct short-sight That convex lenses are used to correct long- sight