What will eventually come of stem cell research?

Will we be able to regrow clear lenses in place of ones clouded by cataracts? Cure macular degeneration? Will we ever be able to regenerate lost limbs? Will we rebuild damaged or diseased internal organs? What are the potentials and what are the limits beyond which science suggests that stem cell technology will never reach?

Interestingly, I was already developing this question in my text editor when this posting from @nofurbelowsbatgirl prompted me to complete it and ask it.