Reference for Bekhorot 75:51
שחור נכנס בלבן אינו מום:
<big><b>MISHNAH: </b></big>ONE WHOSE RIS [EYELID] IS PERFORATED, NIPPED OR SLIT, OR IF IT HAS A CATARACT OR A TEBALLUL,<span class="x" onmousemove="('comment',' Explained below in the GEMARA:');"><sup>37</sup></span> HALAZON [SNAIL-SHAPED], NAHASH [SNAKE-SHAPED]<span class="x" onmousemove="('comment',' The Gemara explains this below.');"><sup>38</sup></span> AND A [BERRY-SHAPED] GROWTH ON THE EYE, [IS DISQUALIFIED]. WHAT DOES TEBALLUL MEAN? THE WHITE OF THE EYE BREAKING THROUGH THE RING AND ENCROACHING ON THE BLACK, BUT IF THE BLACK BREAKS THROUGH THE RING AND INVADES THE WHITE, IT IS NOT A [DISQUALIFYING] BLEMISH, [BECAUSE THERE ARE NO DISQUALIFYING BLEMISHES AS REGARDS THE WHITE OF THE EYE].<span class="x" onmousemove="('comment',' For only the black part is looked upon as the eye. Added with Sh. Mek.');"><sup>39</sup></span>