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.