They'll use eye chart tests, pictures, letters, or the "tumbling E game." This game can check how well your child sees the form and detail of objects, a measure called visual acuity.

It's a basic test that can detect eye or vision issues, but it won't diagnose an exact problem. Vision screening aims to identify reduced vision and eye conditions that may progress to loss of vision.

This series of tests helps a doctor check your vision and eye health. Learn about exam frequency, normal vs. abnormal results, and more.

The basic concept remains the same regardless of platform: You take a read-the-eye-chart test at home, and an eye doctor reviews your results to determine if your current prescription is still OK.

This eye test chart was first invented by Ferdinand Monoyer, a French opthalmologist, or eye doctor, who would have been 181 years old today. Who was Ferdinand Monoyer?

If one eye is seeing 20/200 or less, the other eye must be 20/40 or better to pass the eye test. People are considered as legally blind when their corrected vision in both eyes is 20/200 or less.

A perfect 20/20 score on an eye chart test doesn't mean you have perfect vision: Visual acuity, along with color, contrast, and depth perception, are all important parts of healthy eyesight.