When your child sits down to do her homework tonight, take a look at her eyes. if she’s squinting or rubbing them frequently, closing one eye to read or complaining about headaches or “tired eyes,” she may need a vision screening. An estimated 25 percent of school-age children have vision problems, according to the American optometric Association. The most common are nearsightedness (close objects can be seen clearly, but far objects seem blurry) and farsightedness (which can affect vision at any distance if it’s severe). But if your child has always had one of these conditions, she may not realize it’s possible to see more clearly. “Ask her if the edges of certain objects look sharp at different distances to determine if she can see things accurately both near and far,” advises Mark Borchert, MD, director of the Vision Center at Children’s Hospital Los Angeles. If you suspect a problem, have her evaluated by a pediatric ophthalmologist.