A minor may read the Torah or serve as translator. However, he may not divide the Shema, nor may he go before the Ark, nor may he lift his hands [to bless the people].  One whose clothes are tattered may divide the Shema and serve as translator. However, he may not read the Torah nor may he go before the Ark, nor may he lift his hands.  A blind man may divide the Shema and serve as translator. R’ Yehudah says: Anyone who has never seen the luminaries may not divide the Shema.