Astanga Hrudaya
तृतीयपटलच्छेदादसाध्यं निचितं व्रणैः । शङ्खशुक्लं कफात्साध्यं नातिरुक् शुद्धशुक्रकम् ॥ २५ ॥
When the third layer is broken it gives rise to many wounds/ ulcers and becomes incurable. From Kapha Sudha Sukra is produced, in which the cornea has white color like that of a conch shell and without much pain; this is curable.
english translation
tRtIyapaTalacchedAdasAdhyaM nicitaM vraNaiH । zaGkhazuklaM kaphAtsAdhyaM nAtiruk zuddhazukrakam ॥ 25 ॥
hk transliteration by Sanscript