Reference for Niddah 99:16

ואמרינן

WHOSOEVER IS ELIGIBLE TO ACT AS JUDGE IS ELIGIBLE TO ACT AS WITNESS, BUT ONE MAY BE ELIGIBLE TO ACT AS WITNESS AND NOT AS JUDGE, and when the question was raised, 'What was this intended to include?' R. Johanan replied, 'To include one who is blind in one eye'?<span class="x" onmousemove="('comment',' Which clearly shows that according to R. Johanan no blind man is eligible to act as judge. Why then did he raise no objection against the blind man's conduct? ');">¹⁴</span>

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