132 OPHTHALMOLOGY FOR VETERINARIANS 



and diffuse. If the macula does not become affected, 

 central vision remains good. There is little hope of re- 

 storing the chorioid to its normal conditions, as atrophy 

 of the affected areas usually follow. 



Purulent chorioiditis is the result of infected wounds, 

 ulceration of the cornea, and metastasis in cases of 

 pyemia and septicemia. The whole uveal tract is usu- 

 ally involved. It may undergo absorption when the 

 globe becomes shrunken. Panophthalmitis is a condi- 

 tion in which the globe ruptures in its orbital portion, 

 affecting the orbital tissues; or purulent inflammation 

 may originate in the orbit and perforate the coats of 

 the eye. 



In all the forms of optic neuritis, retinitis, and chori- 

 oiditis, except the purulent type and those associated 

 with iritis, there is no pain and no external evidence of 

 the disease. The diseases of the retina and chorioid are 

 spoken of by some as ''internal ophthalmia," but this 

 term is indefinite, except to indicate an inflammation of 

 the internal structures of the eye. 



