Astanga Hrudaya
न रात्रावपि शीतेऽति नेत्रे तीक्ष्णाञ्जनं हितम्। दोषमस्रावयेत्स्तब्धं कण्डूजाड्यादिकारि तत्॥२२॥
When there is severe cold, application of strong eye-salve is not good even at nights, because it does not cause elimination of the Doshas from the eyes. Instead, it produces itching, inactivity etc. Here Doshas get stagnated inside the eyes, even after Anjana therapy, due to cold effect.
english translation
na rAtrAvapi zIte'ti netre tIkSNAJjanaM hitam। doSamasrAvayetstabdhaM kaNDUjADyAdikAri tat॥22॥
hk transliteration by Sanscript