Abstract
Exophthalmos or proptosis is usually considered, and rightly so, to be due to something in the orbit pushing the eye forward. Only a careless observer would confuse the different conditions in which the eye itself is enlarged, e. g. buphthalmos, with the protrusion of a normal eye, or at least a normal sized eye, in advance of its normal or natural position. The "something," i. e. the cause of the exophthalmos, may be one of a variety of things, and some of them and what is best to do for them will be briefly considered. Instruments to measure the protrusion have been devised, so that one does not have to depend on the sense of sight or touch to know when an eye protrudes beyond its fellow. The best known instrument is the Hertel exophthalmometer, a satisfactory instrument though somewhat difficult to use. It must be carefully applied to the
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