r unions of the orbit 553 



Treatment.— No treatment beyond rectifying the primary 

 condition of which it is a symptom is recommended. 



PARASITES OF THE EYE. 



Lice (pediculi) are often found on the margins of the 

 lids and on the skin over the orbital region. Mange mites 

 also invade the lids. The demodex mite may enter the 

 Meibomian glands, conjunctiva and lacrimal apparatus. 

 The Filaria oculi canini is occasionally found, and spiroptera 

 have been noted in the eyes of birds. 



FRACTURE OF THE ORBIT. 



Common in animals. Careful palpation will reveal 

 crepitation. 



Treatment.— Treatment should follow the general principles 

 of surgery. Possible injury to the eyeball demands first 

 consideration. 



INFLAMMATION OF THE ORBIT. 



Usually results from traumatism. Due to the abundance 

 of fat, inflammation of the orbit spreads rapidly and always 

 endangers the optic nerve and eyeball. It is usually diffi- 

 cult to obtain proper drainage or to apply antiseptics to 

 stop the progress of the inflammation. An attempt should 

 be made, however, to secure drainage and keep the parts 

 clean. 



TUMORS OF THE ORBIT. 



Infrequent. Sarcomas, carcinomas, epitheliomas and oste- 

 omas have been noted in this region. It is usually necessary 

 to enucleate the eyeball in order to remove them. Malig- 

 nant tumors arc apt to recur. 



