Manya's science teacher explained in the class that many children now a days are having weak eye sight because they do not take proper diet and maintain poor life style by playing games on mobile and watching TV till late night. Manya discussed this with her mother and promised to take proper meal so that she can maintain a good eye sight.
What are the common defects of vision?

Explanation

Some common defects of vision are ,
(a) Myopia or short sightedness:- The defect of vision when a person can see near by objects but can not see distant objects clearly is called myopia. It can be corrected using a concave lens.
(b) Hypermetropia or far sightedness : The defect of vision when a person can see distant objects but not near by objects clearly is called hypermetropia. It can be corrected using a convex lens.