I just visited my retina guy and he told me about the latest developments.  These days they&#x27;re modifying the genome of stem cells and printing small clusters of retinal cells onto a substrate for implantation.<p>There have been some successes curing serious blindness issues but they will be hesitant for a good long while to &quot;cure&quot; things like colorblindness.  If things go wrong a blind person is still blind, but a colorblind person has quite a bit to lose.