. Diseases of the dog and their treatment. ich are closelyadherent to its posterior surface (Fig. 149). This condition occurs 426 DISEASES OF THE EYES especially in bulldogs, pugs and the toy spaniels, although it may occurin any breed. The dog does not possess a complete bony arch of theeye (zygomaticus), the space being filled up by a ligament, and themuscles are also very weak. Occasionally, from some mechanical force,such as blows in the region of the eye, or bites in its neighborhoodcausing hemorrhage and a large amount of blood to collect in the posteriorpart of the orbit, it is pushed o
. Diseases of the dog and their treatment. ich are closelyadherent to its posterior surface (Fig. 149). This condition occurs 426 DISEASES OF THE EYES especially in bulldogs, pugs and the toy spaniels, although it may occurin any breed. The dog does not possess a complete bony arch of theeye (zygomaticus), the space being filled up by a ligament, and themuscles are also very weak. Occasionally, from some mechanical force,such as blows in the region of the eye, or bites in its neighborhoodcausing hemorrhage and a large amount of blood to collect in the posteriorpart of the orbit, it is pushed out of position. Frec|uently the entireeyeball is crowded out, standing out on the face clear of the orbit, (tumors,etc.)- Simple pressure of the fingers on the supraorbital cavity of pugsor spaniels is sufficient to make the eye protrude, opening the eyelidsmechanically; luxation of the inferior maxillary also causes protrusionof the eyeball. It is also observed in that rare affection called Basedows -tr-^i^ n 1 , H 1 $i.^ • ^- ; Mr It:. Fig. 149.—Dislocation of the eyeball. disease. This condition has been noticed in very rare instances to bedue to inflammatory processes inside the eye, and by the formation oftumors in the orbits. The prognosis of a prolapsed eyeball depends largely upon the cir-cumstances and condition of the organ. If the prolapse is of recentorigin, if the muscles of the eye and optic nerve are not torn, and if theeye itself has not been very much injured, we may expect completerecovery in a short time without any disturbance of sight. If the pro-lapse is recent and the muscles are not torn, or only partially so, but theeye is al)normally distended, we must expect there is some irritation ofthe optic nerve, and while the eye may be restored the animal mayremain blind. If the muscles of the eye and optic nerve are laceratedand the eye proper is injured, or if any of the chambers of the eye arefilled with blood, or if the prolapse has been sufficiently lo
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