Autism and developmental delay A child with an autism spectrum disorder, cerebral palsy or pervasive developmental disorder (PDD) may also suffer from a developmental delay within their vision abilities. At Vision Therapy, we treat developmentally delayed children and progress their vision and visually integrated sensory skills. As a result, our patients’ experience an increase in their learning abilities, an increase in their abilities to perform day-to-day tasks and they respond more effectively during other rehabilitative services.