I'm afraid I'm with Midchuck - Break them for spares!
It costs more to keep two active 'innocents' on dialysis than one (full) 'lifer' in prison (and with more than one prisoner, the costs drop as the machine can be shared).
It should be fairly easy to teach the prisoner to read Braille (especially when he/she is up against a deadline).
That's the kidneys and corneas redestibuted (and such other bits as can be used), this also means that there needn't be a mad rush to match donor and recipeant as the donor won't be going anywhere.
I say make the ba*d pay his/her 'debt to society' with their body.

Walrus (in a militant mood)