I'm not sure yet.

Also think about the tools he would need to be a carpenter.. special measuring devices he could read with his hands.. maybe a drop string level with a mark he could feel with his hands to ensure the cabinets are hung level... idk why I am so caught up in the minutiae of this blind carpenter's life... well hope that helps.

Kewl. Yeah I think a medieval blind carpenter, mainly making furniture and cabinetry, would work well. He would have connections across the various classes of the town. It would be good. Making simple hope chests and tables for the poorer families and ornate cabinetry and dinning room sets for the wealthy.

You could even have a bit about how his father was the blacksmith, but checking the work when it was red hot was impossible, so he apprenticed with the carpenter in town, who only had daughters. Once he had surpassed the master carpenter, the master carpenter realized his potential and left the woodshop to him in his will. Or something.. or could be more tragic.. like the carpenter was older and all his sons had died in the crusades or whatever long standing conflict is happening in the story.