Peter Miller and Sierra Powell have written this article for American Politics Research.  Here is the abstract:

We examine the extent to which Americans with disabilities vote at the polls or take advantage of convenience voting reforms relative to voters without disabilities. The Help America Vote Act (2002) sought, in part, to increase polling place accessibility for the voters with disabilities, with a particular focus on those with vision disabilities. We construct two operationalizations of disability from the November Voting and Registration Supplement of the Current Population Survey over eight elections. A multinomial logistic model shows voters with a disability are significantly less likely to vote but are more likely to vote by mail ballot. Early in-person voting reforms have a marginal effect on the voting behavior of voters with disabilities. A matching model reveals adopting no-excuse absentee voting, permanent absentee voting, or both reforms increases the likelihood of voters with a disability casting a mail ballot.

This is an important contribution by two UCI grad students whose doctoral committees I sat on.  Highly recommended!