178 . THE MANAGEMENT AND DISEASES OF THE DOG. 



The condition, however, is less irritable than in simple or 

 acute ophthalmia. 



Treatment. — Tonics ; seton in the poll ; painting the out- 

 side of the orbits with iodine ; sponging the eyes with cold 

 spring water ; the application of zinc lotion, 2 grains to the 

 ounce of water, or nitrate of silver, i grain to the ounce ; are 

 the measures usually adopted and indicated. The seton is 

 especially invaluable in these cases. 



CATARACT. 



Cataract may be either lenticular, capsular, or capsulo- 

 lenticular. It is lenticular when there is opacity of the 

 crystalline lens, capsular when the opacity is confined to the 

 capsule, and capsulo-lenticular when both lens and capsule 

 are involved. 



Though more frequently seen in old dogs, cataract may 

 take place at any age. 



Causes. — Inflammation of the eye-ball ; diminished vitality 

 consequent on old age. 



Symptoms. — The presence of an opaque body which may 

 be best seen from a posterior side view in a shaded light, or 

 in a dark place by candle-light. 



Treatment.— ^^\\\% consists entirely in the operation of 

 extraction, and which only can be p; r.'ormed by an experi- 

 enced oculist. 



AMAUROSIS. 



Amaurosis, cotpmonly known as gutta serena, is an im- 

 pairment of vision, consequent on a disordered condition of 

 the retina, optic nerve, or brain. This disordered condition 

 may proceed from external violence, as blows or falls on the 

 head, producing immediate .paralysis, or giving rise to inflam- 



