1 82 The Management and Diseases of the Dog 



or cold ; there is opacity of vision, and conjunctival conges- 

 tion. 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. If corneal 

 ulceration exists, the application of the dry oxide of zinc 

 has almost a specific effect, and may be repeated daily 

 until the eye is perfectly clear. 



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. — This consists entirely in the operation of 

 extraction, and which only can be performed by an ex- 

 perienced oculist. 



AMAUROSIS. 

 Amaurosis, commonly 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 

 mav proceed from external violence, as blows or falls on 



