Ophth - Equine Flashcards
What ocular nerve block can you use for motor function? What does it block? What does it do?
Auriculopalpebral nerve block - facial nerve, paralyses upper lid
What ocular nerve block can you use for sensory function? What does it block? What does it do?
Supraorbital block - trigeminal nerve, upper lid analgesia
What is seen in the upper part of a horses eye that is normal?
Corpora nigra = granular iridica
What is a sub-palpebral lavage system?
Tube into lower eyelid - suture tube in to allow flushing
What should you do if a horse gets an eyelid tear?
Refer it
See if any major structures are involved
What suture do you use to repair an eyelid?
FIgure 8 suture
Through skin and sub cut/subconj - do not penetrate conjunctiva as will cause corneal trauma
What types of eyelid neoplasia can horses get?
SCC
Melanoma
Sarcoid
What lymph nodes do eyelid neoplasias drain to?
Parotid and mandibular lymph nodes
What are 3 causes of corneal ulceration?
Trauma
Infection - EHV-2
Eosinophilic
How do you treat an uncomplicated ulcer?
Remove cause
Antibiotic cover
Analgesia
Fly mask
What will an infected ulcer have?
Creamy white infiltrate
What is keratomalacia?
Melting ulcer - collagenases
What type of condition is equine recurrent uveitis?
Auto-immune disease
What are the anterior signs of uveitis?
Yellow vitreal change
Miosis
Aqueous flare
Keratic precipitates
Hypopyon
What are the chronic signs of uveitis in horses?
Depigmentation/irregularity of pupil margin
Loss of granula iridica
Cataracts
What does a normal equine fundus have?
Choroidal vortex of vessels on optic disk
Oval optic disc
What are the posterior segment signs of uveitis?
Bullet hole lesions - scars on retina
Retinal detachment
What are the different classifications of equine recurrent uveitis?
Classic - acute flares, then fine
Insidious - persistant low grade
Posterior - more changes to posterior eye
End stage - severe blinding
How do you treat equine recurrent uveitis medically?
Atropine
NSAIDs
Topical steroids
How can you treat equine recurrent uveitis surgically?
Cyclosporine implant
Pars plana vitrectomy
What is the most common cause of equine glaucoma?
Secondary to equine recurrent uveitis
How do you treat equine glaucoma?
NOT prostaglandins - increase inflammation from ERU
CAi and Beta blockers
Enucleation
What can cause cateracts in the lens?
Uveitis
Trauma
