Dyslexia is a learning ability characterized by problems in expressive or receptive oral or written language. The word dyslexia is derived from Greek, "dys" means poor or inadequate and "lexis" means word or language. Thus, dyslexia means someone who have difficulty learning to read due to one or more information processing problems such as visual perceptual or auditory perceptual deficits. Children who have this problem can able or difficult to read, spell, write, speak or listen.

Dyslexia occurs among all groups, age, gender, race or income. Recent research has established that dyslexia can happen among relatives, such as parents, brother, sister, aunt or grand parent. Studies performed that there are strong evidence that dyslexia is hereditary.

Children may have dyslexia or a learning ability if they have one or more of the following symptoms:

• poor sequencing of number, of letter in words when read or written e.g. : b-d; sing-sign; left-felt; 12-21
• difficult to understand or remembering what they have just read
• difficult to decoding or encoding words or difficult to understand and remember what is said to them
• difficult to express thoughts in written form or orally
• delayed spoken language
• confusion about directions in space, direction and time (right or left, up and down, early and late, yesterday and tomorrow, months and days)
• difficult in mathematics

This ability is not a disease and it has no cure. It's not the result of law intelligent, but its results from differences in structure and function of the brain. Many dyslexics are creative and have unusual talent in area such as art, athletic, architecture, graphics, electronics, mechanics, drama, music or engineering.

When we found a child having difficulty one or more of those following signs, a comprehensive neuro developmental exam is important. This exam includes testing of hearing, vision, neurological development coordination, visual perception, auditory perception, intelligence and academic achievement.

Often, perception problems can be held with simple exercises, which either help to improve a specific problem or teach techniques to compensate a problem. These often can be done at home, however a few case need a referral to an educational or speech therapist.