lammation of the deep structures of the eye. Cataract may be simple, or
complicated with amaurosis, adhesions, etc.

_Symptoms._--It is known by the whiteness or loss of transparency of the
lens, although the pupil dilates and contracts. Sight may be totally lost;
however, evidence is usually manifested that the animal distinguishes light
when brought out of a darkened stable. For the most part the formation of
cataract takes place slowly, the cases in which it originates very quickly
being but few.

_Treatment._--There is only one method for the treatment of cataract--a
surgical operation for the removal of the lens; but this is not advisable,
for the sight can not be perfectly restored, and objects would be seen
imperfectly without the aid of glasses.

AMAUROSIS.

This is a paralysis of the nerve of sight or the expansion of the retina.

_Causes._--This is the result of concussion from a blow upon the forehead,
fracture of bone over the eye (causing downward pressure), rheumatic
inflammation of the optic nerve, or from extension of deep inflammation of
the eye involving the retina. It sometimes occurs as the result of
excessive loss of blood or of great debility.

_Symptoms._--In this disease observation is seldom made until the animal in
its gait and by its action indicates blindness. Generally both eyes are
affected. The eyeball remains clear, and the pupil is permanently dilated.
No response to light is manifested.

_Treatment._--If caused by debility, loss of blood, or associated with
rheumatism, general blood tonics may be given in the feed, namely, powdered
sulphate of iron, 1 dram; gentian, 2 drams; nux vomica, one-half dram; to
be given twice a day. In cases of rheumatism, one-half ounce of saltpeter
may be added.

FILARIA OCULI (WORM IN THE EYE).

_Filaria oculi_ (provisionally taken as the larva of _F. cervina_) is a
small white worm, found swimming in the aqueous fluid in the anterior
chamber. It may be apparently harmless for a long time, but will eventually
induce keratitis with inflammatory exudations.

_Treatment._--The cornea may be punctured at its upper and outer margin,
and the worm squeezed out with the aqueous humor. The latter will be formed
again. This operation results disastrously unless the greatest care and
skill are employed.

CORNEAL DERMATOMA (HAIRY TUMOR ON THE EYEBALL).

In a few instances this has been seen as a congenital growth. The tumor
arises from the cornea or