The deaf have a special difficulty unless they can read lips. They cannot hear the word being spoken. The blind can hear as can the lame. The deaf are often isolated. How many sign language interpreters are usually on the lectern as the priest gives a homily. Even more difficult would be a Latin Mass, when the priest faces the tabernacle during most of the Mass. I have a feeling B16 is getting ready to normalize the Latin Mass. This will be an obstacle....
sorry for the double post double post!