Hi,
My first cat, Sydney, who is no longer with us , was all white with one blue eye and one green. Sydney was deaf as a doorknob. I took us a while to realize that he was deaf because it always seemed as if he could hear loud noises, such as the vacuum cleaner (vibration). We thought he was ignoring us when we called him! It was only much later that I learned that white cats with blue eyes are very often deaf.