Studies show that a small subgroup of individuals with visual impairments are also diagnosed with autism. The following articles are a great read in understanding visual impairments and autism.
A cross disability: Visual impairments and autism
Autism assessment in children with optic nerve hypoplasia and other vision impairments
Autism and sight or hearing loss
Could my visual impaired client be on the autism spectrum?
Literacy ideas for students who are visually impaired with autism spectrum disorder
Visual impairments: Its effect on cognitive development and behavior