R. Star wrote:
But watches, boots and hyposprays can? Again, why are those acceptable but the eye isn't?
The replicators make foodstuffs from inorganic material. I don't know if it was ever used to create living organisms, or individual body parts.
Those bandaides Picard was wearing in Best of Both Worlds was called "synthiflesh".
The one armed man from Kira's terrorist group claimed that he didn't want to get a new arm, and later Nog went through some weird mental problems trying to accept his new leg.
Kidneys from a pill.
McCoy couldn't make Spock new eyes after the jellyfish episode, and they had a blind girl who had a dress that used Daredevil like echo location to fake sight.