KriyaKalpa has a specific importance in ShalakyaTantra. Kriya means Chikitsa (therapeutic action). Kalpa means Yoga (specific formulations). So KriyaKalpa means Chikitsa (therapeutic action) by Yoga (specific formulations). Acharya Charaka has explained about Vidalaka, Ashchyotana and Anjana. Acharya Susruta and Vagbhata has described about Tarpana, Putapaka, Seka, Ashchyotana and Anjana. Acharya Sharangadhara has explained about Tarpana, Putapaka, Seka, Ashchyotana, Anjana, Pindi and Vidalaka.Tarpana are also known as Netra Basti. It is a procedure by virtue of which eye gets Tripti (nourishment or satisfaction). Tarpana is indicated for Timira, Avila Darsana, Ruksha, Parisuska and Atisuska, Stabdhata, Krichchhronmeela, Daruna and Klishtavartma, ShirnaPakshma,Sirotpata, Siraharsha, ArjunaSavrana Shukla, AvranaShukla,Abhishyanda, Adhimantha, Anyatovata, Vataparyaya, Shuskakshipak etc.

 Proper Tarpana provides sound sleep, blissful awakening and cleanliness of eyes, perfect color vision, normal functioning of eyes in all respect, lightness of the eyes. According to modern pharmacology various drugs used in the form of eye drops or eye ointment enter the eye ball by passing through the cornea. This penetration depends upon the permeability of various layers of cornea. The epithelium and endothelium are highly permeable for lipid content as compared to stromal layer. Thus, fat soluble drugs readily penetrate the stromal layer. Thus, for complete penetration of the drug, it should be lipophilic as well hydrophilic.