1. Short-sightedness & Long-sightedness Done by: Timothy Loe 2A320 Science Ace- Thematic Studies

2. Short-sightedness Myopia Means that you are unable to focus on distant objects Caused by Cornea too curved Eyeballs too long Resulting in Making distant objects looking fuzzy and blur

3. Diagram

4. Long-sightedness Hyperopia Light rays are focused behind the retina Caused by Eyeballs being too small Cornea not curved enough Lens not thick enough Resulting in Find close objects fuzzy and blur but not distant objects

5. Diagram

6. Treatment Short-sightednessLong-sightedness Glasses- Divergent lensGlasses- Convergent lens Contact lens

7. Divergent lens Causes exiting rays to be divergent coning out than when they are entering the lens

8. Converging lens Causes exiting rays to be more convergent

9. Animation GO

10. References Animation- http://www.kettering.edu/physics/drussell/Demos/RayTrac e/Lenses.html http://www.kettering.edu/physics/drussell/Demos/RayTrac e/Lenses.html Content- http://www.bupa.co.uk/healthinformation/directory/s/myo pia http://www.bupa.co.uk/healthinformation/directory/s/myo pia http://en.wikipedia.org/wiki/Myopia http://www.bupa.co.uk/individuals/healthinformation/direc tory/l/long-sightedness http://www.bupa.co.uk/individuals/healthinformation/direc tory/l/long-sightedness http://en.wikipedia.org/wiki/Hyperopia Images- http://www.google.com/imghp?hl=en&tab=wi

11. Thank you