Please explain this para in simple words...

Dear student,
In this paragraph , it is telling about the defects in our vision. Which type of defects are there , we will come to know after reading this paragraph.
There are commonly 2 types of defects naming "myopia" and "hypermetropia"
In myopia , person becomes unable to see the objects which are placed at a large distance. They don't face any difficulty on seeing the objects which are placed near to them. The another name of this defect is "near-sightedness"
In hypermetropia, person becomes unable to see the objects which are placed near to them( for example reading a book). They don't face any difficulty on seeing the objects which are placed at a large distance. The another name of this defect is "far-sightedness"

The main reason of these defects is the changes size of the eyeball. The image does not form of retina , and it causes the occurrence of this defect. However these defects can be corrected by using the lenses. It helps our eye lens to form the image of retina.
Hope it will help you.
Regards.