(a) It is narrated from Abu Arubah that Ibn al-Zubayr (may Allah be pleased with them both) disliked appointing a blind man as muezzin. (b) This report and the report of Ibn Mas'ud (may Allah be pleased with him) are understood to refer to the case where the muezzin is alone, with no sighted person to tell him the time of the adhan.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2005