I am working on the redesign of the Preferences dialog for an application specifically intended for blind users. The current UI has grown over the years and right now contains about 50-70 different options.
As part of the initial research, I was thinking of carrying out a card sorting to help me understand the user's mental model regarding the options and the relationships between them. There are two problems for this. The first one is that the target users are blind, so traditional techniques for card sorting would not work. The second one is that most/all of the participants would not be able to be physically present for a card sorting session.
Any ideas about how to approach this? Maybe card sorting is simply not a good tool in this case?