How is the iScreen Vision Screener 3000 different than other photoscreeners?

The iScreen Vision Screener 3000 captures digital images of red reflex and corneal light reflex images from the eyes. Other photoscreeners, such as MTI, use film to capture images of the eyes. MTI’s device was the most-widely used photoscreener. It was developed by Dr. Howard Freedman from Redmond, Washington. Dr. Freedman developed a photoscreening device called the EyeCor. The EyeCor photoscreener was designed to work with Polaroid 337 high-speed B&W film (this film has been replaced by 667 films and older cameras must be retrofit). A package of film screened ten children. In 2004, the technology was sold to Eye Care International. Feakins Howson Partnership (FHP) purchased the PhotoScreener technology from Eye Care International. Although there are still many MTI devices in use, the film is increasingly difficult to find and many previous users of MTI are transitioning to digital photoscreeners such as the iScreen Vision Screener 3000?