CORNEAL ULCERATION. 
By G. J. Collins, D.V.S., Ass't State Veterinarian, West Point, Neb. 
An infiltration, followed by suppuration and loss of substance 
of the cornea. Is of common occurrence. 
Etiology. —Infection (streptococci, staphylococci pneumo- 
> 
cocci), debilitating diseases, chronic conjunctivitis, secretion of 
dacryocystitis, (i) I find traumatism the usual causative fac¬ 
tor, oat, wheat and rye hulls; injury by baling wire in hay, by 
barbs on fence, nails in stalls or manger, coarse straw, weeds, 
etc. Some by being struck in the eye with whip, halter rope, etc. 
Also foreign bodies are quite often found. (2) Trachoma, 
trichiasis. (3) Defective nutrition of the cornea, glaucoma, 
paralysis of trigeminus, marasmus. (4) Infection, subsequent 
to operations. (5) Phlyctenular keratitis. (6) Infectious con¬ 
junctivitis of herbivora. (7) Toxins. (8) Canine distemper 
in dogs. (9) Variola. 
Clinical Forms .—The nomenclature of ulcers on the cornea 
is quite extensive and is founded upon peculiarities and symp¬ 
toms. 
(1) Simple ulcer, small, superficial, slight or severe irrita¬ 
tion without a tendency to perforation. 
(2) Deep ulcer, extends to deeper layers and has a tendency 
to perforation, with marked symptoms of iritis and hypopyon. 
There are many other forms, but not any more important 
from a therapeutical or surgical view than the former; suffice to 
name them : Rodent, serpent, marginal ring, transparent, den - 
driform, herpetic, abscessal and catarrhal ulcers. 
Symptoms .—The diagnosis of corneal ulceration, of course, 
is arrived at by the objective symptoms. The subjective symp- 
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