Shalakyatantra
Shalakyatantra is an Important Branch of Ayurved dealing with the diseases & Treatment of Netra(Eye), Karna(Ear) , Nasa(Nose) , Mukha(Oral cavity) & Shira(Head). This Branch is given Prime Importance Among the 8 Branches of Ayurved. Again in this Netra Roag Vigyana is Having Utmost Importance Because if Vision is lost A Blind Man though Rich Can not Enjoy The World So it is Explained that "Sarvendriyanam Nayanam Pradhanam."
This science uses a lots of 'Shalaka' which means probe which justifies the name Shalakya tantra.