Blind people are so poor, at least I think so, for they cannot see the world, the beautiful colors, the charming flowers. Blindness is the condition of lacking visual perception due to physiological or neurological factors. The World Health Organization defined blindness as a visual field of less than 10 degrees in 1972. Their eyes are no any expression and colors. Some eye features even change gradually day by day. And the eye balls may occur gray and white. I think most of us have seen that some blind people always wear black sunglasses
to avoid eyes be seen. I ever made a deep searching online and hold consult with an oculist and found out several ways to cause blindness: childhood blindness, glaucoma, dry eyes, cataracts and trachoma. So keep eye health is an essential thing. Plus, please not stare blind people, or they will get further hurt and keep bad mood.