I won't take credit for this link. One of the students Stephen has passed this over to me and has said that it is very useful for when it comes to applying materials to 3D objects. In his own words Stephen had this to say:
"I found it useful because it has a few different ones for all the wet bits of the eye and the temptation to just use 'glass' always comes out looking... well, glassy. There are a few IOR lists online but that's one of the most comprehensive I've found."
In case you want to take a look here is the link - IOR