Because schools often use color - coded teaching tools, especially in the early grades, parents and teachers may mistakenly think that a child has a learning disability when, in fact, he may have a color - vision deficiency.
وهم يتعلمون ايضا ان يميِّزوا مختلف الاشياء وفقا لملمسها او الاشكال الظاهرة على سطحها ،‏ وليس بحسب لونها .‏