Shalakya Tantra is the subject consisting three subdivisions- 1. Netra roga vigyan (Ophthalmology), 2. Karna-Nasa- Kanth-Shiro roga vigyan (ENT), 3. Mukh & Dant roga (Detistry). These specialties having some different methods  of treatment known as Kriyakalp, like local application of medicine at the site of disease along with systemic administration as well as different type of surgeries including modern  techniques.