This book on Herpes Simplex Virus Epithelial Keratitis shows a kind of ‘living histology’, revealing both morphological and dynamic features of the disease, and explaining mechanisms behind them. It offers great insights helpful for the differential diagnostics and the recognition of less known variants as well as of complications. It is also highly useful for the follow–up of treatment results and the differentiation between an active infection and sequelae. Thus, this book will be an invaluable aid for ophthalmologists and researchers working with ocular surface diseases.