Equine Opthalmology Flashcards
Which ocular nerve block will block motor innervation to the eye in horses and what nerve will it block?
The auriculopalpebral block, blocks the facial (VII) nerve.
Which ocular nerve block will block sensory innervation to the eye in horses and what nerve will it block?
The supraorbital block, blocks the trigeminal nerve.
Anatomically, where does the supra-orbital nerve block anaesthetise?
The upper lid
What percentage of eyelid movement does the upper eye contribute in horses?
75%
Which suture material would be used in eyelid repair?
5-0 absorbable braided
What are the three most common external eyelid neoplasias in horses?
SCC
Melanoma
Sarcoid
What does ERU stand for and what causes it?
Equine recurrent uveitis, caused by an autoimmune disease.
Which structures do anterior iris adhesions link?
Iris to cornea
Which structures to posterior iris adhesions link?
Iris to lens
Which structures to posterior iris adhesions link?
Iris to lens
List five signs of anterior uveitis in the horse
Miosis
Fibrin in anterior chamber
Aqueous flare
Keratic precipitates
Hypopyon
List six posterior signs of uveitis
Bullet hole lesions
Butterfly lesions
Chorioretinitis
Focal retinal detachments
Yellow cellular infiltrate
Vitreal degeneration
What are the four classes of ERU and breifly describe them?
Classic - acute flares and quiescent periods cycle
Insidious - persistent low grade
Posterior - posterior changes predominate
End stage - sever/blinding changes
