Visual disorders screening in children is relevant for the early detection of those impairments that can cause problems in visual development, in school performance, or sometimes, as in retinoblastoma, maybe life threatening. In newborns and infants, the screening aims to the early detection of eye problems such as congenital cataract or retinoblastoma. In preschoolers, its objective is amblyopia and the detection of its risk factors, such as strabismus or refraction errors. In the school age, screening consists in low visual acuity detection due to refraction errors.