How can bread be blind and lame? What are you talking about? The context is that God demands perfect sacrifice and if "offended" by anything less than perfect sacrifice, for that which we would not offer to those above us but offer it to God.
Of course, this is silly because there is no such thing as perfect sacrifice that we can offer to God. And the whole issue of God demanding sacrifices is another issue I don;t want to get into on this thread.
If anything, wasn't the tragedy and Cain and Abel over God's disdain for "grain sacrifices" and his preference for something killed?
I believe there's a lot of commentary, both Jewish and Christian, on this, but if grain sacrifices had been understood as being by their nature unacceptable, they wouldn't have been offered in the temple, and they were.
Anyway, 1:7 mentions "polluted bread" and the verse is a complete thought; the blind, the lame and the sick are mentioned separately in 1:8, presumably imperfect animals. Sounds to me to mean that bad grain and flawed animals are both unacceptable.