This topic has raised an interesting thought problem, I'd wonder if the Sight would even work for a blind wizard, or if it did, how it would manifest, would the ability simply tag onto another sense instead?
My understanding (and I'm sure someone will tell me if I'm way off base) is that the Sight 'simply' takes the metaphysical nature of the wizards immediate area, along with the input of all senses and channels that into a visual image that a mere mortal mind can comprehend and hopefully interpret.
Assuming that the Sight translated whatever the input was at least partially into some form of imagery, would a blind wizard be able to actually utilise that imagery in a useful way? Wouldn't interpreting the visual constructs require some form of reference point regarding what things actually look like, not a problem for someone who was sighted at some point in their life (though as mentioned they would probably heal anyway through Wizard's Constitution), but for someone who was born blind, some of the esoteric imagery that usually accompanies a viewing through the Sight would likely be entirely incomprehensable.
I'm pretty much basing all of this on the line in YS on pg 223:
"When you open your Third Eye, you perceive everything about the world visually"
Any thoughts, or am i massively overthinking things here.
NB: As a plus, the character would presumably be immune to Soulgazes.