Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
27 Cards in this Set
- Front
- Back
what are some differential diagnoses for eye lesions in cattle?
|
new forest (IBKC) listeria uveitis IBR trauma neoplasia |
|
what are some differential diagnoses for eye lesions in sheep?
|
pink eye (IOKC) listeria uveitis trauma neoplasia |
|
what causes IBKC (new forest eye) in cattle?
|
Moraxella bovis (found on normal conjunctiva) flies, dust, UV light spread in summer when flies out |
|
what are the clinical signs of new forest eye in cattle?
|
conjunctivitis chemosis blepharospasm photophobia cornea- central white/ cloudy raised lesion, oedema, after 6 days can vascularise and may causes mild anterior uveitus |
|
you go to visit a cow in july and it has this raised central white lesion on the cornea, what is your main differential?
|
new forest eye (IBKC)
|
|
if not treated, what could the raised white lesion on the cornea lead to? (IBKC)
|
deep ulceration descemetocele rupture panophthalmitis phthisis bulbi |
|
how can you treat new forest eye in cattle?
|
TOPICAL- okay for early cases, long acting cloxacillin or short acting chlortetracycline. SUBCONJUNCTIVAL INJECTION- 1.5-3ml procain penicillin. SYSTEMIC- oxytetracyclin LA, (1st line) florfenicol, (2nd line) ceftiofur, tilmicosin, tulathromicin (3rd line) |
|
how can you control/ prevent new forest eye in cattle?
|
fly control adequate space at feeders quarantine new animals |
|
which species is listerial uveitis more commonly seen in?
|
cattle
|
|
what causes listerial uveitis? (silage eye9
|
listeria monocytogenes related to feeding of big bale of silage therefore associated with housing in the winter |
|
what are the clinical signs of listerial uveitis initially?
|
initially: lacrimation blepharospasm photophobia swollen, folded iris miosis |
|
what are the clinical signs of listerial uveitis within 2-3 days?
|
blueish white corneal opacity spreading centrally. white focal aggregation of fibrin may accumulate in anterior chamber. catarrhal conjunctivitis? |
|
what clinical signs can you see in advanced cases of listerial uveitis?
|
pannus- widespread opacity of cornea, vascularisation notice there is no focal region like in IBKC- diffuse lesion over whole eye |
|
how can you treat silage eye (listerial uveitis)?
|
SUBCONJUNCTIVAL INJECTION- 3ml penicillin and 1ml dexamethasone (didn't give dexamethasone to IBKC due to ulcer) |
|
how would you treat ocular squamous cell carcinoma in a cow?
|
enucleation- recurrence nearly always occurs
|
|
what ocular signs would you see with IBR?
|
conjunctival oedema 3rd eyelid partial prolapse ocular discharge (will also be resp signs) can do PCR on conjunctival swab to diagnose |
|
what are the clinical signs of vitamin A deficiency in cattle?
|
blindness papilloedema xerophthalmia |
|
what is the aetiology of ovine infection keratoconjunctivitis? (pink eye)
|
mycoplasma conjunctivae
|
|
describe stage 1 clinical signs of pink eye in sheep?
|
tear staining due to mild conjunctivitis/ blepharospasm/ photophobia many cases can spontaneously regress at this stage. |
|
describe stage 2 clinical signs of pink eye in sheep?
|
keratitis- cloudy cornea very irritant- increased lacrimation and blepharospasm. |
|
describe stage 3 clinical signs of pink eye in sheep?
|
ocular discharge becomes more mucopurulent may be shallow ulceration |
|
describe stage 4 clinical signs of pink eye in sheep?
|
blind, corneal ulceration hypopyon anterior chamber may rupture= permanent blindness |
|
describe epidemiology of pink eye
|
up to 25% flock affected. introduced by carriers. spread by close contact. winter- feeding, yarding, housing, wind and snow, summer/ weaned lambs- high stocking rates, handling face and head while drenchin, dust, long grass. |
|
what is the treatment for pink eye in ewes?
|
single IM injection of oxytetracyclin LA 20mg/ kg
|
|
what causes bright blindness in hill sheep?
|
prolonged ingestion of bracken. progressive degeneration of retinal neuroepithelium. |
|
what are the clinical signs of bright blindness in hill sheep?
|
separated from flock. high stepping gait and high head position, dilated pupils, reduced PLR. |
|
what will you see when you look through ophthalmoscope?
|
narrowed retinal vessels. hyperreflective tapetum. |