DISEASES OF TIFE EYE. '295 



The attacks vurv <;re!itiy in severity in diiroioiit (uses, but the 

 reciirrt'iKo is rliar:uteri.sti<', and all alike lead to cataiaet and intra- 

 ocular etfu^iun, with pressure on the retijui autl abolition of si»;ht. 



Prevention, — ^The prevention of this disease is the preat object to 

 be aimed at. and this demands the most careful brev'din<;, fcedinof, 

 housing, and general numagement, as indicated under "Causes.'' 

 Much can also be done by migration t>> a high, diy location, l)Ut for 

 this and malarious atl'ei-tions the inifirovrrncnt of the laud by drain- 

 age and good cultivation should be the linal aim. 



2'reatiiunt is not sjitisfactory. but is largely the .same as for com- 

 mon internal oi)hthalmia. Some cases, like rheumatism, are l)euefited 

 by l-scru})le closes of powdcied colchicum and "J-drain doses of sali- 

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

 the globe of the eye from intiaocular efl'usion. aseptic pnnctiire of the 

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

 recovery a course of tonics (2 drams oxid 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 temporary recovery would take place in one or two 

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

 small tooth, leaving its fang in the jaw. only increases the irritation. 



CATARACT. 



The common result of internal ophthalmia, as of the recurrent 

 type, may be recognized as described under the first of these dis- 

 eases. Its offensive appearance nuiy be obviated by extraction or 

 depression of the lens, but as the rays of light would no longer be 

 properly refracted, perfect visicm would not be restored, and the 

 animal would be liable to prove an inveterate shyer. Tf jierfect 

 blindness continued by reason of pressure on the nerve of sight, no 

 shying would result. 



PALSY (W T?5E NERVE OF SIGHT, OK A.MAUROSIS. 



< >/?/.sr.s'.— i lie caii.MS of this affection are tunu)rs or other disea.se 

 of the brain implicating the roots of the optic nerve, injury to the 

 nerve between the brain and eye, and inflammation of the ojitic nerve 

 within the eye (retina), or undue pressure on the same from drop- 

 sical or inflammatory effusion. Tt may also occur fnmi overloaded 

 stomach, from a profuse bleeding, and even from the pressure of the 

 gravid womb in gestation. 



'^>/mptoms. — The symptoms are wide dilatation «)f the pupils, so 

 as to expose fully the inteiior of the globe, the expansion remaining 



