The book “Gonioscopy: A Text and Atlas” is the gold standard for diagnosis and evaluation of all forms of glaucoma. It allows the examiner to actually see any obstruction to the aqueous drainage in the anterior chamber angle by direct visualization of the trabecular meshwork and its adjacent structures. A number of congenital and acquired diseases affecting the eye can be picked up by performing a detailed gonioscopic evaluation and the primary diagnostic use of gonioscopy is to distinguish open angle versus closed angle mechanisms for glaucoma. The book “Gonioscopy: A Text and Atlas” consists 28 chapters with 600 photographs related to the gonioscopy and gives the readers a clear visual understanding of the disease process. The current text and atlas on gonioscopy includes the principle, indications and types of gonioscopy, the techniques for dynamic gonioscopy, classification systems, evaluation of normal anterior chamber angles and clinical findings in various forms of congenital and acquired glaucomas. Additionally, conditions such as ocular tumors, foreign bodies, post-surgical complications, systemic disorders with angle anomalies, etc. have been incorporated. There is a special section on RetCam gonioscopy, intraoperative gonioscopy and gonioscopy after glaucoma surgery including minimally invasive glaucoma surgery.