Dyslexia is a failure to read at expected level. The sociodemographic characteristic of dyslexic children is suggested to affect their perceptual functions. Nurses have an important role in assessing children for any reading disability and help them to cope normally with any psychological distress. The aim of the study: Identifying the relationship between sociodemographic characteristics of dyslexic children and their perceptual function. Subjects and method: The study subjects were composed of 50 children (30 boys and 20 girls). The study was conducted at child outpatient clinic of psychiatric mental health hospital and psychiatric outpatient clinic of Assiut university hospital during one year duration from 30 th November 2012 until 30 th November 2013. Children were assessed through visual and auditory memory tests, in addition to socio economic assessment scale. Results: There was a significant difference as regard sex in which females outperform males but there was no significant difference as regard to age, residence, and socioeconomic levels in relation to visual and auditory memory results .Conclusion and Recommendation: Only sex has a relation to the cognitive function of dyslexic children in which girls outperform boys. Intensive attention should be given to male dyslexic children to improve their cognitive functions.