The book Corneal Topography in Clinical Practice (Pentacam System) Basics and Clinical Interpretation serves as a guide for the students. The book exclusively deals with fundamental aspects of corneal topography and ectatic corneal disease. This is very important for having the aimed results and avoiding postoperative complications. Initial two chapters discuss the refractive Media of the human eye and instruments to measure the corneal surface. Subsequent chapters are on the fundamental aspects of corneal topography, fundamental description, and ectatic corneal diseases. The book also has chapter that covers information on the refractive media of the human eye, corneal topography maps i. e. curvature maps, elevation map, thickness map. Zernike analysis, Progression Index, keratoconus level, keratoconus indices, keratoconus, patterns of keratoconus, keratoectasia and ectatic corneal disorders, Incidence of postoperative keratoectasia, diagnosis of postoperative corneal ectasia,risk factors for postoperative ectasia, decentration, displaced apex syndrome, hotspot syndrome, artifacts in corneal topography maps. The last chapter focuses on the topographical patterns of irregular astigmatism and corneal topography in cataract surgery.