Short-sightedness &Long-sightedness

Done by: Timothy Loe2A320

Science Ace- Thematic Studies

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

Diagram

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

Diagram

Treatment

Short-sightedness Long-sightedness

Glasses- Divergent lens Glasses- Convergent lens

Contact lens Contact lens

Divergent lens

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

Converging lens

Causes exiting rays to be more convergent

Animation

GO

References

Animation-http://www.kettering.edu/physics/drussell/Demos/RayTrace/Lenses.html

Content- http://www.bupa.co.uk/healthinformation/directory/s/myopia

http://en.wikipedia.org/wiki/Myopia http://www.bupa.co.uk/individuals/healthinformation/directo

ry/l/long-sightedness http://en.wikipedia.org/wiki/Hyperopia Images- http://www.google.com/imghp?hl=en&tab=wi

Thank you