It’s often been said that the problem with talking about the disabled is that they are defined by their dis-abilities rather than their abilities. The profundity of this perspective emerges in a moving narrative about a beautiful, blind Irishwoman who is given the gift of sight and how that changes her life and that of her husband and her doctor. In Irish Repertory Theatre’s Molly Sweeney, the last of the Friel Project offerings, prolific Irish playwright and author Brian Friel aptly illustrates how that gift is a mixed blessing.