Dyslexia, a developmental reading disorder, causes difficulties with spelling, reading, writing, and finding the proper words when speaking. A child might be unable to read the word volcano, or might say the similar-sounding “tornado” when presented with a picture, even though he or she knows what a volcano is.
Nevertheless, people with dyslexia may have other language-related deficits such as problems understanding rapid speech, difficulty in following complex or multi-part instructions, or trouble remembering things in correct sequence. Because of the difficulty in processing letter sounds, people with dyslexia are often poor spellers.
Reports say that In the United States, more than 10 million children live with the disorder. Dyslexia is also one of the most common learning disabilities and it affects one in five children.