Question

What are the causes of three common defects of vision

Answer 1

1. Myopia or Nearsightedness =Myopia occurs when the eyeball is too long , relative to the focusing power of the cornea and hence of the eye.

2. Hypermetropia or Faresightedness = The vision problem occurs, when light rays entering the eye focus behind the retina , rather than directly on it.

3. Astigmatism .

4. Presbyopia.

Answer 2

Answer:

the three common defects of vision are

1 use your mobile to often

2 watching tv most of the time and sitting to close to your tv

3 and reading books so closely

hope it was helpful please mark me as brainliest ❤️