Photoscreening is a form of pediatric vision screening that uses a special-purpose camera to determine how well a child can see. Other related terms are autorefractor, objective screening, and instrument-based screening. By detecting special light reflexes from each eye, the devices produce images that can help identify refractive errors (like a prescription for glasses) and ocular misalignments (strabismus). Photoscreening is particularly useful with preverbal children (under age 3 years), young children (age 3 to 5 years), and older, non-cooperative, or non-verbal children. However, photoscreening cannot determine exactly how well a child’s visual acuity is developing.