Weak Eyes
Some dogs, particularly several breeds of spaniels, have naturally weak eyes, attended by an over-secretion and constant flow of tears, more particularly when exposed to the sun. When there is no disease of the lachrymal duct, the secretion may be diminished and the eyes strengthened by the daily application of some slightly tonic wash, as No. 1, 2, 3, &c.
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Fistula Lachrymalis
The lachrymal duct is a small canal, leading from the internal angle of the eye to the nostrils, and is the passage through which the tears escape from the eye. This duct may become closed by inflammation of the lining membrane of the nose, caries of the bone, ulcers, fungous growths, or by the presence of some extraneous substance impacted in it. The tears, no longer having a natural outlet, are necessarily forced over the lids, accompanied, not unfrequently, by a good deal of purulent matter.
This canal, when thus obstructed from some one of the above causes, often forms an ulcerous opening at its upper extremity, just below the internal canthus, for the escape of the pus that usually collects in a sac at that point. This perforation is called "Fistula Lachrymalis." The tears, entering the canal at its punctum, are carried along till they pass out at the fistulous opening.