Blindness is defined as a state from total loss of sight and the presence of residual visual limited. A Blind Person is the person who has a complete loss of sight or the person who has the remains of a limited visual discrimination amounting to some colors. And the person is legally blind when visual acuity less than 20 \ 200 and field of vision less than 30 degrees.

A blind person can read through:

o Braille: Braille letters are symbols composed of Obtrusive dots that can be touched by the fingers.

o Audio records: by listening to audio records

o Screen Reader: A computer program that reads everything that appears on the screen of the computer. This way the blind can read electronic text including those listed on the internet.

o White cane: Some of the blind use white canes to help them move around independently.

o Sighted guide: Some of the blind chose to accompany a sighted guide to help them move around.

o Use of other senses: Some of the blind can wander in closed places depending on their other senses and their sensual conception.