DISEASES OF THE HOESE. 271 



In the intervals between the attacks some remaining symptoms 

 betray the condition, and these become more marked after each suc- 

 cessive access of disease. Even after the first attack there is a bluish 

 ring round the margin of the transparent cornea. The eye seems 

 smaller than the other, at first because it is retracted in its socket, and 

 often after several attacks because of actual shrinkage (atrophy). The 

 upper eyelid, in place of presenting a uniform, continuous arch, has 

 about one-third from its inner angle an abrupt bend, caused by the 

 contraction of the levator muscle. The front of the iris has exchanged 

 some of its dark, clear brilliancy for a lusterless yellow, and the 

 depth of the eye presents more or less of the greenish yellow shade. 

 The pupil remains a little contracted, except in advanced and aggra- 

 vated cases, when, with opaque lens, it is widely dilated. If one e3'^e 

 only has suffered, as is common, the contrast in these respects with 

 the sound eye is all the more characteristic. Another feature is the 

 erect, attentive carriage of the ear, to compensate to some extent for 

 the waning vision. 



The attacks vary greatly in severity in different cases, but the recur- 

 rence is characteristic, and all alike lead to cataract and intraocular 

 etTusion, with pressure on the retina and abolition of sight. 



Prevention. — The prevention of this disease is the great object to be 

 aimed at, and this demands the most careful breeding, feeding, housing, 

 and general management as indicated under causes. Much can also be 

 done by migration to a high, dry location, but for this and malarious 

 affections the improvement of the land b}^ drainage and good cultiva- 

 tion should be the final aim. 



Treatment is not satisfactory, but is largel}^ the same as for com- 

 mon internal ophthalmia. Some cases, like rheumatism, are benefited 

 by scruple doses of powdered colchicum and 2-dram doses of salicylate 

 of soda twice a day. In other cases, with marked hardness of the 

 globe of the eye from intraocular effusion, aseptic puncture of the 

 eye, or even the excision of a portion of the iris, has helped. During 

 recovery a course of tonics (2 drams oxide of iron, 10 grains nux 

 vomica, and 1 ounce sulphate of soda daily) is desirable to invigorate 

 the system and help to ward off' another attack. The vulgar resort to 

 knocking out the wolf teeth and cutting out the haw can only be con- 

 demned. The tetfiporar}^ recovery would take place in one or two 

 weeks though no such thing had been done, and the breaking of a 



!iall tooth, leaving its fang in the jaw, onl}" increases the irritation. 



CATAKACT. 



The common result of internal ophthalmia, as of the recurrent 

 type, may be recognized as described under the first of these diseases. 

 Its offensive appearance may be obviated by extraction or depression 

 of the lens, but as the rays of liglit would no longer be properly 



