Here follows a general exposition of the instructions which the sainted lord of Benares, the holy Dhanvantari of profound intellect imparted to his disciple the son of Vis'vamitra (Sus'ruta) regarding the different medicinal measures (Kriya) such as Tarpana (soothing), Seka (sprinkling), A'schyotana (eye-drops), Puta-pakas Anjanas (eye-salves), etc., mentioned before in different places to be employed in diseases of the eye. 2-3.
The measure known as Tarpana should be employed in respect of an affected eye either in the fore-noon or in the after-noon under the auspices of propitious astral combinations, after having purged the head and bowels of the patient and subsequent to the digestion of any food previously taken. The patient should be laid on his back in a chamber not exposed to the rays of the sun, and the gust of the wind, and where the atmosphere is not charged with minute particles of floating dust. The region of his eye (i. e. eye-lids) should be thickly coated with powdered Masha pulse, pasted (with water) in the form of a circular wall which should be even, hard and compact. Then a quantity of the transparent upper layer of clarified butter should be stirred with the admixture of a quantity of lukewarm water and poured (Purana) into the cavities of the eye up to the eye-lashes and retained therein for as long a period as one would take to count five hundred, six hundred, eight hundred, and ten hundred syllabless respectively in cases of healthy persons and persons with Kapha-origined. Pitta-origined and Vayu-origined diseases of the eye. According to certain authorities, the periods of such retention (of clarified butter) should vary with the seat of the affection (in the eye-ball). The clarified butter mentioned above should, according to them, be retained in the cavities of the eye for as long a period as one would take to utter three hundred, five hundred, seven hundred, one thousand, or eight hundred syllables respectively in cases of the diseases confined to the region of the Sandhi, Vartman, Sukla, Krishna, the eye in general (Sarva-gata) and the Drishti of the eye *. The clarified butter should then be secreted through the interior corner of the affected organ which should be purified by applying poultices of pasted barley. The Kapha, deranged by the use of this Sneha-Purana should be then conquered by making the patient inhale some kind of Kapha-subduing Dhuma (smoke). This rule † should be observed for one, three or five days in succession. 4.
Sleep at the first call, unembarrassed waking, cessation of secretion, clearness of vision, agreeable sensation, perceptible amelioration of the disease, and lightness of the organ are the symptoms which result from a proper and satisfactory Tarpana of the eye. Cloudiness of vision, a sense of heaviness in the affected organ, excessive glossiness (of the eye), lachrymation, itching, sliminess and an aggravation of the Doshas are the features which mark a case of severe and excessive Tarpana. A sense of dryness in the affected organ, cloudiness of vision, profuse lachrymation, sensitiveness to light and an aggravation of the disease are the evils which follow an act of defective Tarpana (of the eye). 5.
* According to some, the 'Purana' should be retained in the eye for a period required to count one thousand syllables in cases of Sarva-gata and eighteen hundred words in casts of Drishti-gata eye-diseases.
† According to Gayadasa, this rule should be observed for one, three, or five days in cases of the preponderance of Vayu, Pitta and Kapha respectively, and according to Jejjata, in cases of mild, moderate and severe attack respectively.