Autism spectrum disease (ASD) is a nervous disorder. In this disease children have sensory processing dysfunction and they unable to communicate, interact, and showed repetition in behaviours. The present study was designed to determine visual impairment frequency in children with autism spectrum disorder (ASD). A descriptive study was performed in Paediatrics Department of Children's Hospital and The Institute of Child Health, Lahore. Data was collected in six months and 52 patients of both gender were considered. A total of 40 boys and 12 girls of 3-8 years old children were included. A structured Questionnaire based on visual perception was designed to determine the visual sensory processing issues in children with an autism spectrum disorder. The findings showed a strong difficulties in the visual sense particularly in differentiation among the colours and eye tracking in autism children. It was concluded that sense of sight highly affected in the patients of autism spectrum disorder.