Commentary for Kiddushin 48:13
וצריכא דאי אשמועינן הך קמייתא משום דמעיקרא נהורא בריא והשתא נהורא כחישא אבל הכא דמעיקרא נמי נהורא כחישא אימא לא
the slave does not go out [free] on their account. R'Shaman said to R'Ashi: Are we to assume that sound is nothing?<span class="x" onmousemove="('comment',' Because he was blinded by sound he is not freed.');"><sup>25</sup></span> But Rami B'Ezekiel learnt: If a cock stretches its head into the cavity of a glass vessel, crows th and breaks it, he [its owner] must pay for it in full.
Daf Shevui to Kiddushin
If I only had the first baraita, I might say that if the master severely weakens his eyesight or tooth, so much so that he cannot use them, he goes free. But if the eye is already weak and he puts it out, he does not go free because it was already weak. Therefore we need the second baraita.
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