It’s essential to keep in mind that vision screenings take a very basic look at your eyesight and are not used to diagnose or treat vision problems. They are designed to merely detect them and are often performed by a school nurse or pediatrician. While a vision screening may be useful in identifying a vision impairment that requires further care, it is by no means a substitute for a comprehensive eye exam. As a rule, the only way to precisely detect and diagnose any vision abnormalities or identify the presence of eye disease is through a comprehensive and in-person eye exam.