A new device attached to a Smartphone has been invented to provide objective vision screening of young children including infants and newborns. The inventive device includes a main plane body which haves a cylindrical container for holding the optical elements and a house for holding the beam splitter. The main plane body is attached to a Smartphone. While the optical elements making the streak of light beam and moving it across the pupils of children, the camera of a Smartphone records the relative movement of the retinal reflex of the children eyes, which gives the information of refractive status, clarity of refractive media, alignment of the both eyes and other conditions of the eyes that may cause amblyopia. The principal of this device is similar to conventional streak retinoscopy, but it examines both eyes simultaneously and has more advantages.
