Rhases gives very copious and sensible directions on this subject, but
many of them are the same as those given by our author. He forbids all
gross and diffusible articles of food, and also thick wines. Although he
cautions against reading books written in small characters, he recommends
exercising the eyes by looking at large letters or pictures. He also
recommends various collyria, containing antimony, tutty, calamine,
camphor, and the like. (Ad Mansor. iv, 22.)