Natural light has lost its prime importance due to the development and growth in the use of artificial light over the past century,this dearth of natural light in educational systems causes a significant problem in educational spaces, which makes an impact negative on human behaviour, which contributes to a decline in educational performance. In the absence of research on the subject, it is necessary to explore the influence of natural light, on the visual comfort of users in order to improve the quality of space in reading areas.The aim of the subject, is the necessity to explore the influence of natural light, on the visual comfort of users in order to improve the quality of space in reading areas. This research work focuses on the region of Oum El Bouaghi characterized by a hot and dry semi-arid climate, uses the Post OccupationalEvaluation(POE)based on a questionnaire, with 70 participants to study the qualities of the visual comfort of the reading room of the university library. The results collected indicate the level of luminosity in the studied area is insufficient with unsatisfactory conditions leading users to use artificial lighting during the majority of the day throughout the year. Although glare, contrast and shadow effect have no direct influence on reading activity, also the role of aperture is totally ignored, which gives a gloomy and boring impression reading by analysing the Independent and dependent variables it has been stated that although all independent variables affect dependent variable. Therefore, this contribution has revealed significant results that could be used by managers in their mission to develop the natural lighting system in university library reading rooms.