This branch of ayurveda deals in details with the etiology, diagnosis, prognosis, prevention and treatment of diseases of head, ear, nose, eye and throat. The name of this branch was called Shalakya due to excessive use of 'Shalaka', which means a rod or probe. Though all the three main classics of ayurveda deals on this subject, Susruta Samhita describes more deeply about this branch. So much so that some of the classifications found in the Susruta Samhita are mot even traced by the modern medical science. It described five types of pterygium, and the prognosis it made about aveitis and glaucoma has not been improved since. In fact he is the first surgeon in medical history who systematically and elaborately dealt with anatomical structure of eye.