Salient Features: This edition consists of 7 sections including 24 chapters. It is very rich in information, figures, illustrations, and clinical examples. It follows Sinjab's methodology in the step-by-step systematic approach. It covers: ¿ Clinical basics of corneal optics, geometry, topography and tomography ¿ All profiles, maps and displays of the Pentacam HR including the Belin Ambrosio enhanced ectasia display, Holladay report, and corneal topometry ¿ Clinical basics of wavefront analysis and measurements including Zernike analysis and Fourier analysis ¿ New tomographic definitions and features of ectatic corneal diseases ¿ Grading systems of ectatic corneal diseases including the Belin ABCD keratoconus staging. It is the first book to: ¿ Establish screening guidelines ¿ Present a new systematic interpretation of corneal tomography and practical subjective scoring system ¿ Discuss factors of false positives and false negatives ¿ Address tomographic features of corneas after keratorefractive procedures and after corneal grafts ¿ Study in-depth corneal irregularities using a new 4-selective composite map and new understanding of corneal astigmatism ¿ Address the new concept of corneal refraction and related subjects such as objective corneal dioptric power and astigmatic dissociation ¿ Show the importance of enantiomorphism ¿ Present entities misdiagnosed as ectasia and how to differentiate them from ectasia ¿ Discuss progression criteria of ectatic corneal diseases, corneal tomography and aberrometry in cataract surgery.