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