‘DISEASES OF THE EYE, 295 
The attacks vary greatly in severity in different cases, but the 
recurrence is characteristic, and all alike lead to cataract and intra- 
ocular effusion, 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 by drain- 
age and good cultivation should be the final aim. 
Treatment is not satisfactory, but is largely the same as for com- 
mon internal ophthalmia. Some cases, like rheumatism, are benefited 
by i-scruple doses of powdered colchicum and 2-dram doses of sali- 
cylate 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 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 may be obviated by extraction or 
depression of the lens, but as the rays of light would no longer be 
properly refracted, perfect vision would not be restored, and the 
animal would be liable to prove an inveterate shyer. If perfect 
blindness continued by reason of pressure on the nerve of sight, no 
shying would result. 
PALSY OF THE NERVE OF SIGHT, OR AMAUROSIS. 
Causes —The causes of this affection are tumors or other disease 
of the brain implicating the roots of the optic nerve, injury to the 
nerve between the brain and eye, and inflammation of the optic nerve 
within the eye (retina), or undue pressure on the same from drop- 
sical or inflammatory effusion. It may also occur from overloaded 
stomach, from a profuse bleeding, and even from the pressure of the 
gravid womb in gestation. 
Symptoms.—The symptoms are wide dilatation of the pupils, so 
as to expose fully the interior of the globe, the expansion remaining 
