22 VETERINARY OPHTHALMOLOGY. 



with the outer sheath of the optic nerve and with the 

 periosteum of the orbit. 



OrMtal cellulitis. — Diseases of the orbit may be either 

 simple oedematous cellulitis or phlegmonous cellulitis. 

 In the oedematous form there will be bulging forward 

 of the bulbus. Little pain on pressure occurs in the 

 young and subsides in a few days. The phlegmonous 

 form is much more severe ; swelling of the lids, 

 especially the upper ; pain, which may be intense and 

 will tolerate no pressure on the globe ; eye is pro- 

 truded directly forward. 



Exophthalmus. — In some severe cases have abso- 

 lutely no motion; * will have cheraosis of conjunctiva; 

 symstoms almost always acute, and the crisis is 

 reached in 8 to 14 days. Tissues on palpation will be 

 found firm, tense and hard. All this may go on, the 

 bulbus become involved and have inflammation of 

 all parts of the eye—jxoiojyhthalmitis. When pus 

 forms, as it may, fluctuation may be found behind the 

 lids. Abscess may burst through conjunctiva or lids. 

 May result from injuries, periostitis and inflammation, 

 of lachrymal gland. 



Treatment. — Antiphlogistics early. Should sup- 

 puration occur, poultices and incision through conjunc- 

 tiva between the lids. Exploration is good when in 

 doubt, and better to use knife too early than too late. 

 A large majority of these cases recover, and about the 



* Compare periostitis. 



