Introduction This database includes the raw data linked with the paper “Visual function and neuropsychological profiling of Idiopathic Infantile Nystagmus” accepted for publication on “Brain Sciences”. In this paper, we aimed to a) describe visual function in children with Idiopathic Infantile Nystagmus (IIN) b) investigate its possible impact on neuropsychological development and its implications in functional vision, such as learning abilities. The spreadsheet includes data on medical history and clinical characteristics of the 60 included subjects (columns A-I), visual functions and neuro-ophthalmological data (columns J-U), cognitive and visuocognitive data (columns V-AM), school learnings performances (columns AN-AR), neuroradiological, electrophysiological and genetic data (columns AS-AV). The encoding of data is presented in the second sheet. Methods This retrospective cross-sectional work included 60 patients (43 males; mean age 7 years, range 2 months-17years, 9 month) diagnosed with IIN from January 1st, 2007 to May 31st, 2023. Data about clinical and diagnostic evaluations were collected in a data set during a review of medical records. Results (in brief) The majority of subjects in our cohort presented reduced VA for far distances and normal VA for near distances associated with oculo-motor abnormalities. The overall scores of cognitive and visual-cognitive tests were in the normal range but revealed peculiar cognitive and visual-cognitive profiles, defined by specific frailties in processing speed and visual-motor integration compared to the other performances. The same neuropsychological profiles characterize many neurodevelopmental disorders. As the first exploring neuropsychologic competencies in children with IIN, our study unveils the presence of subclinical frailties that need to be addressed to sustain academic and social inclusion.