Investigate the two types of sight defect- long-sightedness and short sightedness.
Find the following information:
a) what causes the defect
You are more likely to develop it if it runs in your family
You are more likely to develop myopia if it runs in your family
If your cornea is too curved
b) the symptoms displayed
Far objects become blurry but close objects are normal
Far objects are clear and normal but close objects become blurry
c) propose what sort of lens may be used to correct each vision
The sort of lens that can be used to correct this defect is a concave lens as the light is passed through is bent into the eye directly and clearly.
August 19th, 2008
in
Science |
