Astanga Hrudaya
अत्युद्रिक्ते बलासे तु लेखनीयेऽथवा गदे। काममह्य्नपि नात्युष्णे तीक्ष्णमक्ष्णि प्रयोजयेत्॥२०॥
In condition of extreme increase of Kapha or in diseases which require Lekhana Anjana – scraping type, Teekshna Anjana – strong type, can be put into the eyes even during day time, if desired, only if the day is not very hot
english translation