A human eye which can see far off objects or distant objects clearly but can not see the near objects clearly is said to be suffered with a defect known as long sightedness or far sightedness or Hypermetropia.

Causes of Hypermetropia: This defect arises due to either by

• the increase in the focal length of eye lens or
• the size of the eye ball becomes too small so that the light rays from the nearby points or objects are not brought to focus on the retina of the eye.