Parents want their children to do well at school. But 80% of learning depends on vision, so ensuring your child has good vision is crucial to successful learning. Your child may not realize they have a vision problem, they may simply assume everyone sees the way they do. A vision-related problem may cause: Headaches or irritability. Difficulty staying on task. Avoiding work. Covering or rubbing the eyes. Losing place or using finger to maintain place while reading. Omitting or confusing small words when reading. Performing below their potential. Eye redness or discharge.