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Entropium — Inversion of the Eyelids
This disease we do not find mentioned by any of the writers on canine pathology: nevertheless, we are led to believe that it is not an uncommon form of ophthalmia; and we must express our surprise that it should have escaped the attention of such close observers as Blaine and Youatt.
The acute form of the disease resulting from, or attending, simple ophthalmia, we have often witnessed, but the chronic form, of which we more particularly speak, is more rare. We have seen three cases of the latter, and, no doubt, might have found many more if our opportunities of studying canine pathology were equal to those of the English writers. The inversion of the eyelids upon the globe is accompanied with pain and irritation, swelling and inflammation, both of the lids and eye, which ultimately renders the dog almost useless, if not entirely blind.
Causes
. — Neglected chronic ophthalmia was, no doubt, the cause of the disease in two cases, a setter and a pointer, while the other, in a hound, was the result of an acute attack of ophthalmia brought on by scalding with hot pitch thrown upon the animal. Some of this substance entered the eye, while a large portion adhered to the muzzle and lids. The eye, as well as the lids, became inflamed; the latter, being puffed up and contracted on their edges, were necessarily drawn inwards from the tension of the parts, and double entropium was thus produced. The inflammation and tumefaction of the parts continued for a considerable time, and when ultimately reduced by the application of tepid fomentations, the skin appeared greatly relaxed; and the muscular fibres having lost their power of support or contractility, owing to their long quiescence, seemed no longer able to keep their lids in their proper situation; the edges therefore remained in the abnormous position previously assumed.
By this strange condition of the parts, the eyeball continued greatly irritated by the constant friction of the lashes; water was continually flowing over the lids, and from its irritating character produced considerable excoriation of the face and muzzle. The conjunctiva remained inflamed, the cornea in due course became ulcerous, and the eye was ultimately destroyed by the discharge of its contents. This was the course and final termination of the disease in the case of the hound above referred to, all of which disastrous results might have been prevented by proper management.
Treatment.