Eye muscle coordination problems and accomodative (focusing) disorders can sometimes cause symptoms of eyestrain and discomfort. Though more common in younger people, these conditions can affect people of all ages.
The problem is often first noticed by a teacher when a child's grades begin to slip or they complain of difficulty with reading. Some people notice occasional doubling of their vision. These patients don't necessarily need glasses, they need therapeutic techniques to strengthen their eyes' ability to focus and work together. Vision therapy usually consists of in-office therapy visits combined with maintenance at-home eye exercises.
If your child has been complaining of headaches or difficulty keeping their place when reading, or if you yourself sometimes have that all to familiar "pulling sensation" with prolonged near work, stop in for an evaluation.