As parents flock to back-to-school sales in coming weeks, you may need to add eyeglasses to the pens, school uniforms, laptops and backpacks on your child's back-to-school supplies list.

Why?

Your son or daughter may be among the one in four children in the U.S. with a vision impairment significant enough to affect their ability to learn.

Why is seeing clearly in the classroom so important?

It's said that 80 percent of what a child learns through age 12 is through their eyes.

The best way to know if your child needs glasses is to put a comprehensive eye exam for him or her on your back-to-school to-do list.