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equine opthamology
eyes
21
Veterinary Medicine
Graduate
03/07/2016

Additional Veterinary Medicine Flashcards

 


 

Cards

Term
eye exam
Definition

- IV sedation helpful

- palpebral nerve block to overcome blepharospasm by orbicularis muscle

- proxymetacaine- squirt onto cornea, will anaesethetise the ocular surface

- direct and indirect opthalmoscopy

 

Term
eyelid problems
Definition

Entropion

sarcoids

SCC

trauma

Term
Entropion
Definition

not uncommon in neonatal foals, usually self limiting and frequently caused by systemic disease causing retraction of the globe.

- can use frequent manual repositioning and lubricant, but if fails, then vertical mattress sutures can be placed. Leave in for 2-4 weeks

Term
Sarcoids
Definition

an option to inject BCG vaccine into the lesion under sedation. upto 7 treatments are required

best option: iridium wire has the best results but is expensive and requires referral

 

Term
SCC
Definition

especially in white haired horses- eyelid skin and conjuctiva

- confirm by biopsy

- treat with surgical excision

Term
eyelid trauma
Definition

quite common, principles for surgical repair as for dogs, careful reconstruction of lid margins.

always check for corneal damage

Term
Problems of the conjuctiva
Definition

Conjuctivitis

SCC

Term
Conjuctivitis
Definition

- usually the result of either opportunist bacterial infection associated with flies in the summer, or URT viruses

- BS ab for 5 days topically, and fly control

Term
Nasolacrimal system
Definition

signs of epiphora may not appear for several months, from congenital non patency

- frequently complicated by dacrocystitis

- cannulate duct and exise over opening

Term
Corneal ulcer
Definition

- deep

- underrun

- melting

- viral

 

Term
underrun ulcers
Definition

debride under topical anaesthesia

bandage lenses

Term
melting ulcer
Definition

treat aggressively with antibiotics and anti-collagenase agents

 

Term
viral ulcers
Definition

tiny punctate or linear ulcers, do not stain well with fluorescin, topical antiviral therapy and idoxuridine are most effective but hard to get hold of.

apply alot for the first 48 hr. then 4-6X daily .

Term
equine recurrent uveitis
Definition

appaloosas, warmbloods are common

- acute, non-granulomatous inflamm of the uveal tract, auto-aggressive T cell mediated disease

Treatment:

- box rest in dark box, ideally insert lavage system

- antiinflamm therapy: flunixin then oral bute

- atropine drops to effect

- enucleation  best option

Term
The lens
Definition

acquired cataracts are complication of severe uveitis

 

Term
Glaucoma
Definition

uncommon in horses, might be due to high uveoscleral outflow in this species

- most cases are 2ndary to chronic uveitis and have a poor prognosis

-

Term
normal fundus
Definition

tapetal color is related to coat color

- yellow: light coloured and chestnut animals

blue: greys and blacks

disc- horizontal oval

30-60 vessels extending from the optic disc

 

Term
butterfly lesions
Definition
pale irregular areas of retinal degeneration
Term
bullet hole lesions
Definition
small , frequently multiple, focal lesions
Term
senile retinopathy
Definition
pigment clumping in NTF usually in linear forms with adjacent depigmentation, no treatment
Term
ischaemic injury to optic nerve
Definition

sudden onset blindness

becomes pale with assoc. atrophy of retinal vessels

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