(Most post-schism Western Saints would also be worthy of consideration. In that we are separated by this tragic schism, though, it would be more fitting to concentrate on the pre-schism Saints who have been designated as intercessors for persons with disability. )
One such Saint is Saint Gerald of Aurillac. Saint Gerald was frequently ill as a child, and later in life he became blind. He was a nobleman and also a layman, as his bishop recommended. He practiced prayer, chastity, and almsgiving. As a nobleman, he had the reputation of being unusally conciliatory and peaceful, as well as merciful to adversaries and criminals. He also spearheaded the establishment of a monastery.
St. Gerald of Aurillac, pray for us.
Here are some websites on St. Gerald of Aurillac:
http://en.wikipedia.org/wiki/Gerald_of_Aurillac – lots of references to other sources as well as a brief account of his life.
http://saints.sqpn.com/saint-gerald-of-aurillac/ – a sparce record; at the bottom, though, are the specific personal areas for which he is an intercessory patron saint.
http://www.vlib.us/medieval/lectures/gerald.html – a critical, academic account.