The Compendium of Caraka 4.1.121

4.1.121

yo bhūtaviṣavātānāmakālenāgataśca yaḥ/
snehaśītoṣṇasaṃsparśo mithyāyogaḥ sa ucyate
rūpāṇāṃ bhāsvatāṃ dṛṣṭirvinaśyatyatidarśanāt/
darśanāccātisūkṣmāṇāṃ sarvaśaścāpyadarśanāt//

Contact with evil spirits, poisons, and winds, and contact with unctuousness, cold, and heat / arriving out of season: that is called improper contact. / Sight is ruined by excessive gazing at radiant forms, / and by gazing at extremely subtle ones, and also by not looking at all;