How do you know if a child requires glasses?

Squinting is a sign that a child needs glasses because it may point to a refractive error. Other indications include rubbing the eye excessively, tilting the head or covering one eye, complaining of eye pain or headache, or sitting too close to the television. A child may show the need for glasses when they hold hand-held devices too close to the eyes, demonstrate difficulties concentrating at school, use a finger to read, or lose their place when reading.