Commentary for Avodah Zarah 56:12
כגון מאי אמר רב יהודה כגון רירא דיצא דמא דימעתא וקידחא ותחלת אוכלא לאפוקי סוף אוכלא ופצוחי עינא דלא
What, for example [is considered a life-threatening eye injury]? R. Judah said: Such as discharge, pricking, congestion, watering, inflammation or the first stages of sickness, excluding the last stage of sickness or the brightening of the eyesight in which cases it is not permitted.
Daf Shevui to Avodah Zarah
The Talmud distinguishes between eye injuries that are threatening and therefore can be healed on Shabbat, and those that are not and cannot be healed on Shabbat.
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