​CAHILL, Patrick Keary, Optician, of 13 and 15 Wellington Quay, Dublin; b. 1853. Optician to Pope Leo XIII., Pius X., Benedict XV., and now Pius XI; author of Life and Lectures of Dr. D. W. Cahill, and Essays on Vision; contributor to the Ophthalmic journals; received the great Jubilee Medal from Pius X., 1909, and gold medal of 1910. One of the founders of the Catholic Boys' Brigade, Dublin, and Christian Brothers' Past Pupils' Union. Rea.: Ard-na-Greine. Rathmines, Dublin.