Autism Spectrum Disorders (ASD) in Blind Children: Very High Prevalence, Potentially Better Outlook

Area of Science:

• Neurodevelopmental disorders
• Ophthalmology
• Pediatric neurology

Background:

• Autism spectrum disorder (ASD) is a neurodevelopmental condition characterized by challenges with social interaction and communication.
• Blindness, particularly congenital blindness, presents unique sensory and neurological experiences that may influence neurodevelopment.
• The prevalence of ASD in blind populations is not well-established, leading to potential underdiagnosis and lack of targeted interventions.

Purpose of the Study:

• To investigate the prevalence of autism spectrum disorders (ASD) in a cohort of children with blindness.
• To explore potential correlations between ASD and factors such as type of blindness, etiology, sex, brain damage, and socioeconomic status.
• To examine the phenomenon of autism recovery in blind children and discuss implications for understanding ASD pathogenesis and outcomes.

Main Methods:

• A cross-sectional study was conducted on 38 unselected children attending a school for the blind in Cordoba, Argentina.
• Children were assessed for autism spectrum disorders (ASD) using established diagnostic criteria.
• Data on blindness characteristics, demographic factors, and neurological status were collected and analyzed.

Main Results:

• Autism spectrum disorders (ASD) were identified in 19 out of 38 (50%) children with blindness.
• The prevalence of ASD was significantly associated with total congenital blindness, irrespective of its cause or other factors.
• Four verbal children with ASD demonstrated signs of 'recovery', suggesting a potentially different course in this population.

Conclusions:

• Congenital blindness is a significant risk factor for autism spectrum disorders (ASD), suggesting a distinct pathogenic pathway possibly related to altered sensory input and brain reorganization.
• The high prevalence and potentially better outcomes in blind children with ASD highlight the need for increased awareness and specialized diagnostic approaches.
• Further research is crucial to elucidate the mechanisms underlying ASD in congenital blindness and to develop effective interventions.