The free screenings are usually conducted in daycare centers and preschools.
Technicians use a special camera to photograph each child's eyes.
The camera produces a photograph containing two pictures of the eyes, which will show the crescent, if any, in the eyes. Depending on the size and placement of the crescent, an eye care professional or a trained technician can determine if there is a possible refractive error or an alignment problem. A group of pediatric ophthalmologists donate their time to analyze those photos that indicate possible vision problems. The postcard states that the child shows symptoms of amblyopia and recommends that the child receive a complete eye exam with an eye care professional of their choice. Questionnaires are mailed to the parents' two months after the postcard is sent, to ask if the child received a professional eye exam and what the results of the exam were.