Treatment Monitoring in Autism Spectrum Disorder (ASD) in Children

This study seeks to evaluate the utility and performance of the EarliPoint(™) System: Evaluation for Autism Spectrum Disorder in monitoring changes in a child's verbal ability, non-verbal learning, and social disability over time in children ages 15-84 months with autism spectrum disorder and in those who are typically developing. The main questions it aims to answer are: * To estimate the change in each of the EarliPoint index scores in typically developing children ages 15-84 months from baseline through 180 days as a function of the child's age. * To estimate the change in the EarliPoint verbal and non-verbal index scores in ASD/DD children ages 15-84 months from baseline through 180 days as a function of the child's age in: a) those who showed clinical improvement, and b) those who did not show clinical improvement. * To estimate the relationship of the EarliPoint verbal and non-verbal index scores to clinical reference assessments in ASD/DD children as a function of their age from baseline through 180 days. * To estimate the degree of change, if change occurs, month-to-month in the EarliPoint Social Disability Index score from baseline through 180 days. * To estimate the incidence of behavioral events (e.g., tantrums, etc.) which limit the subject from completing an eye-tracking session. * To estimate the incidence of adverse device effects associated with the use of the study device.