The geometric optics basis

At the request of our students 3rd year License in Optical Instrumentation of the Institute of Optics and Precision Mechanics - University Ferhat Abbes Sétif 1 Algeria I have honor to present this modest work with a concern for rigor and clarity. Work inspired by several well-known references. This course which I taught for five years covers some optical elements (mirror diopter and lens) in a fairly educational way and very rich in information especially the first chapter it was well studied on all levels. In the last chapters we discuss in detail the optical aberrations and the human eye and its components. In the end we present the various vision defects (Ametropia) and their corrections. Overall this manuscript provides students with basic but useful information namely the basic elements of geometric optics and allows them to acquire other knowledge in the context of more in-depth studies. I hope that this manuscript will provide valuable help not only to preparatory or university students but also to our teaching colleagues.