Śatapatha Brāhmaṇa ("of a hundred paths") 3.1.3.10

3.1.3.10

athākṣyāvānakti | arurvai puruṣasyākṣi praśānmameti ha smāha yājñavalkyo durakṣa iva hāsa pūyo haivāsya dūṣīkā te evaitadanaruṣkaroti yadakṣyāvānakti

Thereupon he anoints the eyes. 'Sore, indeed, is the eye of man; mine is sound,' so spake Yâgñavalkya. Dim-eyed, indeed, he was (heretofore); and the secretion of his eyes was matter. He now makes his eyes sound by anointing them.