Discussion on Irideal cyst
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Fran
Member
Username: Fwilsak
Post Number: 11
Registered: 6-2004
| | Posted on Friday, Dec 29, 2006 - 3:43 pm: |   |
Not sure if I spelled it correctly, but this is what the vet called the small, round, brown lesion that became more easily visible when the atropine treatment for a corneal ulcer dilated my 6 yr old QH gelding's pupil. He said it is nothing to worry about, very common. Not much more info offered.
I have since noticed he has another in the other eye. It seems as though they would affect his vision as they are directly in front of his pupils. Do they grow in size/number as the horse ages? Anything I should watch for? Can they become malignant?
I could not find a discussion or reference on this, unless they are called something else.
Thanks for your help.
Fran |
Robert N. Oglesby DVM
Moderator
Username: Dro
Post Number: 17356
Registered: 1-1997
| | Posted on Saturday, Dec 30, 2006 - 11:02 am: | |
If I understand correctly what your horse has these irideal cysts are normal in the horse Fran and are most often called corpora nigra. I reserve the term "cyst" for pathological conditions though you do see this term used in the literature.
If you will start carefully looking at horses eyes you will see most horse have them and they can be very variable in size and number. There are descriptions of them in the reference/image/ section on eyes and I am sure you will find discussions about them using the more common term. They do sometimes change slighty with age but not in any dependable manner.
If you remain uncertain this is what we are talking about post a picture for us. Be sure to angle the camera so as not to get a glare reflected back into the camera.
DrO |
Connie McRill
Member
Username: cmcrill
Post Number: 7
Registered: 6-2005
| | Posted on Monday, Sep 1, 2008 - 9:18 pm: | |
My 10 year old show hunter has a spooking problem that has significantly increased in the last few months. Specifically, he now sometimes spooks at the footing in the ring, if there is an irregular area or a tire track mark. One of the monthly horse magazines had an article about the corpora nigra of the iris. A horse described in the article was spooking more, they then treated the corpora nigra with laser to shrink them, and the spooking significantly improved. My horse does have these on his irides, as I know most horses do, and they do seem large, but also on some of my other horses that don't spook. Could it be a contributing factor to the problem? Have you heard of this being treated in this manner? Everyone tells me to get my horse's eyes checked for the spooking problem. As a human ophthalmologist, it doesn't make a lot of sense to me. I don't see an obvious cataract or corneal opacity, and the pupils look normal. And his spooking doesn't occur all the time or in any one lighting condition. It can happen any time without warning. Spooking at irregularities in the footing, though, seems strange. We have done a scintigraphy which showed uptake in the coffin joints, not unusual for a jumping horse, so injected those joints and the spooking hasn't really improved. Any other ideas? |
Rachelle E. Morris
Member
Username: rtrotter
Post Number: 25
Registered: 4-2008
| | Posted on Monday, Sep 1, 2008 - 9:53 pm: | |
I think getting your horses eyes checked is a good idea. Maybe there is something bothering him that is making him spook more. In the meantime try riding him with a fly mask under his bridle. The fly mask dulls what he sees without restricting his sight.
Rachelle |
Diane E.
Member
Username: scooter
Post Number: 2756
Registered: 9-2000
| | Posted on Monday, Sep 1, 2008 - 11:11 pm: | |
Does he only spook when being ridden? If you lunge him or walk him in halter does he spook at the same footing? |
