Question

what four factors are required so that we are able to see​

Answer 1

the surrounding environment should be clean .air n water borne disease will not spread.

personal hygiene prevent infectious disease.

proper,sufficient nourishment ni food is necessary for god immune.

immunization against severe diseases.

hope it's helpful to you, buddy.

Answer 2

Explanation:

1 . Power of accommodation

2. Persistence of vision

3. The for point and near point of the human eye .

Hope it will help u

give a thanks if it's helpful