Short-sightedness &
Long-sightedness
Done by: Timothy Loe
2A320
Science Ace- Thematic Studies
Means that you are unable to
focus on distant objects
Myopia
Caused by
Cornea too
curved
Eyeballs too
long
Short-sightedness
Resulting in
Making distant
objects
looking fuzzy
and blur
Diagram
Light rays are
focused behind
the retina
Hyperopia
Eyeballs being
too small
Caused by
Resulting in
Cornea not
curved enough
Find close
objects fuzzy
and blur but not
distant objects
Lens not thick
enough
Long-sightedness
Diagram
Short-sightedness
Long-sightedness
Glasses- Divergent lens
Glasses- Convergent lens
Contact lens
Contact lens
Treatment

Causes exiting rays to be divergent coning
out than when they are entering the lens
Divergent lens

Causes exiting rays to be more
convergent
Converging lens
GO
Animation
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Animationhttp://www.kettering.edu/physics/drussell/Demos/RayTrac
e/Lenses.html
Contenthttp://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://en.wikipedia.org/wiki/Hyperopia
Imageshttp://www.google.com/imghp?hl=en&tab=wi
References
Thank you