Over the past ten years tremendous progress has been achieved in corneal surgery. This volume – the 6th in the 'ESASO Course Series' – reflects the most relevant topics ranging from basic knowledge to the most advanced techniques. It covers the functional anatomy with medical and surgical management of the ocular surface, provides information on high-risk corneal transplantation and explains techniques such as corneal collagen crosslinking, femtosecond laser-assisted penetrating, deep anterior lamellar keratoplasty (DALK) and descemet membrane endothelial keratoplasty (DMEK). Further contributions describe how to manage astigmatism after corneal transplantation as well as indications of intrastroma corneal ring segments (ICRS) in keratoconus. Well-known corneal and ocular surface surgeons and refractive surgery specialists share their experience in this publication, making it a must-read for every anterior segment surgeon, especially those performing corneal surgery and using corneal refractive procedures.