Sanhedrin 34: A Blind Judge

In capital cases, one arguing for conviction can change and argue for acquittal, but not the reverse - if it's before the time of handing down the verdict. But how does this presentation line up with other comparable sources? It seems that judges cannot reverse a decision to acquit. Also, judging a case in day and at night - where monetary cases are begun in the day time. How far is that taken? What can be done at night? Plus, parallels between the assessment of possible tzara'at and court cases. Including the rule against blind judges. So how could there be a blind judge?