Eye Injuries
Tuesdays with Tony
As we get into the Christmas spirit, it seems horses can sense the strain on your wallet from all that shopping. As a cat I’m a little more conscientious about such things, of course, but horses get some sort of evil pleasure from making their owners squirm.
Every Eye Injury is an Emergency
If you are a horse, one easy way to rack up a big vet bill in a short amount of time is by poking something in your eye. Remember that eye injuries are always an emergency, and the more time that passes before the right medication is initiated, the more expensive they can be to treat.
Corneal Ulcer
This is the most common eye injury in horses, but it can be just the tip of the iceberg. The cornea is the clear outermost layer of the eye that you see through. Puncture wounds, abrasions, and other forms of trauma can cause a break in this layer. Usually these “simple” ulcers will heal just with a few days of triple antibiotic ointment. However, any break in this protective outer layer creates the opportunity for infection. Uh-oh.
Stromal Abscess
When a corneal ulcer gets infected by any of the bacteria or fungus that exists in our lovely Florida soil, it becomes a ‘complicated’ ulcer. What often happens at this stage is the outer layer of cornea heals over, trapping the infection beneath. This is called a stromal abscess, which takes on average 8 weeks of medicating the eye 4 times a day to heal! No fun. A Stromal abscess can often be prevented by early treatment of a Corneal Ulcer. That’s why all eye injuries are an emergency! That, and….
Iris Prolapse
Certain types of fungus that can infect corneal ulcers actually cause the cornea to ‘melt.’ The fancy medical term for this is keratomalacia, which would be great to use in a game of Scrabble! Melting corneal ulcers are the worst of the worst. If left untreated, they can cause iris prolapse, or rupture of the eye. It is every bit as gross as it sounds. Basically, the ooey gooey insides of the eye leak out through the hole in the cornea, until the iris (the part that gives the eye it’s color) blocks the hole. This requires emergency conjunctival graft surgery or enucleation (removal of the eye) to treat. This is definitely not something you want to make your horse endure due to your inaction.
An Ounce of Prevention
You can’t really protect your horse 100% from everything, because they’re a lot like cats in their ability to find a way to cause mischief. However, you can go a long way towards preventing eye injuries (injuries in general, really) by doing a few simple things. First, make sure they don’t have something sharp to scratch on. Check your stalls and fences regularly for nails and broken boards. Broken tree branches are another favorite scratching point. Also, don’t put your horses out with things like rusted-out car bodies, tractor implements, falling-down structures, and things like that. Just because your neighbor’s horse made it in that type of environment for 20 years is no guarantee that yours will.
A quality fly mask can also prevent many eye injuries. Gnats and flies are a major cause of itchy eyes, so keeping them away is a huge help. The mask itself will also keep most scratching sessions from becoming eye injuries. It’s a lot cheaper to buy a new fly mask every year than it is to treat an eye injury. Do your horse (and yourself) a favor, and cover it up!
The moral of the story
If your horse has a squinty, tearing, swollen, or otherwise weird-looking eye, don’t waste any time getting one of our amazing docs to check it out! Quick treatment can make a huge difference in whether or not your horse loses an eye, and it can also be the difference between hundreds of dollars and thousands of dollars. I’m a professional risk-taking cat, and I’m here to tell you: Don’t take risks with your horse’s eyes! There’s nothing to gain, and everything to lose.
Until next week,
-Tony
Tuesdays with Tony is the official blog of Tony the Clinic Cat at Springhill Equine Veterinary Clinic in Newberry, Florida. If you liked this blog, please subscribe below, and share it with your friends on social media! For more information, please call us at (352) 472-1620, visit our website at SpringhillEquine.com, or follow us on Facebook!
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Keep the Pressure On
While beautiful, Red Maple trees are very, very bad for horses. Eating as little as 2 pounds of Red Maple leaves will cause toxicity in horses. Like many plants, wilted leaves contain the most toxin. The toxin, gallic acid, causes the body to attack and kill the red blood cells. This makes the blood unable to carry oxygen. Horses are affected within about 24 hours of eating. They become extremely depressed, and may even have blue mucous membranes. They will also urinate red or dark brown urine. There aren’t great treatment options for this toxin. The Docs give them lots, and lots, and I mean lots, of IV fluids. If they make it 36 hours, it’s very likely they will recover. 
This is one horrible poisonous plant, and ‘Creeping’ is the key word. It creeps along very close to the ground, making it really hard to find. Creeping Indigo also spreads by long, hard-to-pull roots and seeds making it difficult to fully kill in one round. This plant makes you go to full-on war. Horses need to eat around 10 pounds of creeping indigo daily for about 14 days to develop signs. That seems like a lot, but some 
horses develop a taste for this weed and seek it out! The toxins are 3-nitropropionic acid (3-NPA) and indospicine. These toxins attack the nervous system in many weird ways. That means the symptoms of Creeping Indigo toxicity are difficult at best to figure out. They can vary from runny, squinting eyes, sleepiness, nystagmus (this is the fancy term for eyes wiggling back and forth), gait abnormalities, and mild colic-type signs. Yep, a wide variety. To add to the joy that is Creeping Indigo, there are no lab tests to identify the toxin, and no real way to know if it’s the cause of the problem. Special tests on tissue taken after an animal has passed away can identify the toxin. 
Crotalaria is commonly known as rattlepods or rattlebox, due to the sound of the seeds rattling in their pods. This one suckers you in with pretty flowers, then BAM! Your liver gets annihilated. This plant really starts growing in late summer. It like damp places, such as the area around the water buckets or troughs in your pasture. 
This plant often gets planted as a decorative hedge. Horses think decorative hedges have been placed for snacking purposes. One mouthful of this hedge is enough to cause problems! In humans, a very small amount is enough to kill. The toxins in oleander are powerful cardiac poisons like digitoxigenin, and oleandrin. They target the heart muscle and cause it to die. Horses that eat oleander can show signs from poor performance to extreme lethargy depending on how much they ate. All I have to say about this one is don’t plant it in first place. If you do have oleander, be very, very careful removing it. All it takes is some sap in a small skin wound to cause problems with human hearts! 
in nightshade is atropine. My Docs use it as a drug in its purified form. If your horse eats nightshade they will experience fun things like diarrhea, nervousness, irregular heartbeat, and extreme sensitivity to light. Luckily this guy also doesn’t taste very good. Keeping plenty of hay in front of your horses is a great way to keep them from checking out nightshade to see if it’s tasty. Most of the time this one can be treated with time. The easiest way to get rid of it is to check your fence lines regularly and simply pull them up. 
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