Q. Is a blind person allowed to be a chazan?
A. Yes (Shulchan Aruch, Orach Chayyim 53:14). Rabbi Ya’ir Chayyim Bacharach remonstrated with a congregation which dismissed a blind officiant and insisted that they reinstate him. Remember that in ancient days before printing was invented, prayer books were written by hand and were rare, and even a sighted person generally needed to pray by heart.
But do the prayers not refer to the gift of light and acknowledge God as Yotzer HaM’orot - “Creator of the luminaries”? How can a blind person utter these words? The answer is that though he personally cannot see the light of the sun, he benefits from it in many ways (M’gillah 4:6).
A major problem is, however, presented when it comes to reading the Torah, since this must not be done by heart, so a blind person cannot be a Ba’al K’riah. There have been blind chazanim; one of the most famous, from Cape Town, taught generations of Bar-Mitzvah boys and on a visit to Israel amazed the congregation at the Great Synagogue in Jerusalem with his Haftarah talents.