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27 Cards in this Set

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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

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?
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

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?

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

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
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.

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

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

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.