This section is from the book "The Farmers Ready Reference Or Hand Book Of Diseases Of Horses And Cattle", by S. C. Orr. . Also available from Amazon: The Farmer's Ready Reference;.
Puncture of the eyeball sometimes happens by accident while the horse is grazing in the dark among weeds or brush. And it frequently happens that a gash is cut across the cornea on barbed w ire or some other sharp object. If the puncture is small, and if it only pierces the anterior chamber of the eye, allowing only the aqueous humor to escape, the puncture will close and the humor will be reproduced; but if the puncture reaches into the posterior portion of the eye, allowing the vitreous humor to escape, or if part of the cornea should be torn away, the eyesight will be destroyed. But in either puncture or gashing of the cornea, even if the sight is restored, there will always remain a small scar at the point of injury.
Treatment. - Examine the wound carefully and if any part of the foreign body remains in the wound it must be removed. The eye should be bathed for half an hour twice a day with cold water; a piece of old muslin is better to use in bathing than a sponge After bathing each time apply around and in the eye a little of the following: Nitrate of potash and sulphate of zinc, of each, forty grains; fluid extract of belladona, four drachms; rain water, one pint; mix. The animal should be kept in a moderately-dark stable and fed on light diet. If a spongy growth begins to protrude from the wound a little dry calomel may be blown into it. If the eyeball remains white after the wound is entirely healed apply twice a day with a camel's-hair pencil, or with the point of a small feather, a little of the following: Nitrate of silver, four grains; distilled water, one ounce; mix.