Literacy
A sighted child who is reading at a basic level should be able to understand common words and answer simple questions about the information presented. The child should also have enough fluency to get through the material in a timely manner. Over the course of a child's education, these foundations are built upon in order to teach higher levels of math, science, and comprehension skills. Children who are blind not only have the educational disadvantage of not being able to see, but they also miss out on the very fundamental parts of early and advanced education if not provided with the necessary tools.
Read more about this topic: Braille