Equine Uveal Disorders Flashcards
Acute Anterior Uveitis Clinical Signs
- blepharospasm/epiphora
- miosis
- aqueous flare/hypopyon/hyphema
Chronic Anterior Uveitis Clinical Signs
- all acute signs
- cataracts
- retinal detachment
- secondary glaucoma (most common)
- phthisis bulbi
T/F: Equine Recurrent Uveitis is not a common cause of blindness
F, its the most common cause of blindness and effects 25% of horses worldwide
__ ERU is intermittently severe while __ ERU is chronic low grade
Classic ERU is intermittently severe while Insidious ERU is chronic low grade
what are some of the clinical findings you may see with anterior ERU?
miosis, aqueous flare, hypopyon, posterior synechiae
what are some clinical findings of posterior ERU?
chorioretinitis, retinal detachment, vitreal debris/liquefaction
describe the chronic changes you might see with ERU?
chronic changes of cataracts, posterior synechiae, retinal detachment, secondary glaucoma, phthisis bulbi
diagnostics for ERU
lepto titers, conjunctival biopsy or ocular ultrasound
goals of ERU therapy
- control inflammation (preserve vision, maintain comfort)
- Eliminate primary problem
medical therapy of ERU
Treat AGGRESSIVELY until it’s controlled. Treatment includes:
- systemic NSAIDS
- topical corticosteroids
- topical atropine
Then taper the meds to decrease recurrence
when is topical atropine contraindicated?
cases of glaucoma
Sx therapy of ERU
Cyclosporine implants can be placed longterm by incising the sclera and have an 80-90% success rate. A Vitrectomy may also be performed and reduces inflammation but has a high incidence of cataracts.
Prognosis for ERU
50-60% of eyes will lose vision
Uveal Cysts are usually located on the __ and will __ on an exam while melanoma will not. Only treat when__ __.
Uveal Cysts are usually located on the corpora nigra and will transilluminate on an exam while melanoma will not. Only treat when vision impairing.
List some causes of Equine Vision Loss
- congenital cataracts
- optic nerve coloboma
- congenital stationary night blindness
- traumatic optic neuropathy
Congenital stationary night blindness causes horses to be blind at __ with the retina appearing __. Its diagnosed with __ and has __ treatment. __ are the most affected breed.
Congenital stationary night blindness causes horses to be blind at night with the retina appearing normal. Its diagnosed with electroretinogram and has no treatment. Appaloosa’s are the most affected breed.
Traumatic Optic Neuropathy is the shearing of the optic nerve/chiasm causing what?
Acute Irreversible Blindness
