Charak Samhita
आजेनपयसापिष्ट्वाभावयेत्ताम्रभाजने। सप्तरात्रंस्थितंभूयःपिष्ट्वाक्षीरेणवर्तयेत्॥२५५॥
This is called as drishti-prada varti. This varti revives vision even in the blind provided the pupils of his eyes have not undergone any physical change or been damaged. Thus ends the prescription of drishtiprada varti.
english translation
AjenapayasApiSTvAbhAvayettAmrabhAjane। saptarAtraMsthitaMbhUyaHpiSTvAkSIreNavartayet॥255॥
hk transliteration by Sanscript