Investigate the two types of sight defect- long-sightedness and short sightedness.

Find the following information:

1. What causes the defect

The defect is caused by imperfect vision which causes an inability to focus on objects close by.

1. The symptoms displayed

Blindness, fuzzy sight, bad sight, pain in the eyes and so on.

1. Propose what sort of lens may be used to correct each vision.

Positive curvature or Concave lenses,