Early detection of Glaucoma is important. Apart from tonometry and Visual field examination, the simplest and most reliable clue is careful Optic Nerve Head examination. This book gives a detailed description of the Optic Nerve Head and Retinal Nerve Fibre Layer, variation among normal population and, changes that occur in glaucoma. Interesting cases reviews make this a very practical book. Different conditions which may mimic glaucoma have also been covered.