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Neurology (LHW) > Bovine eye > Flashcards

Bovine eye Flashcards

1
Q

Wha topical local anaesthetic can be used in bovine eyes?

A

Amethocaine

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2
Q

Give differential diagnoses for blindness in farm animals

A

CCN
Vitamin A deficiency
Lead poisoning
Twin lamb disease (sheep)

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3
Q

What causes Bovine Iritis/uveitis or Silage Eye?

A

Listeriosis

Big bale silage in Winter

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4
Q

Silage Eye or Bovine Iritis is negative to fluorescein. How is it treated?

A

Atropine - mydriatic
Dexamethasone
+/- oxytetracycline

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5
Q

What ocular signs may BVD present with?

A

Microphthalmia
Cataracts
Retinal dysplasia or detachment

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6
Q

How many days into pregnant does BVD cause occular manifestations?

A

75-150d

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7
Q

What ocular signs may be seen with Bracken poisoning?

A

Hyphaema

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8
Q

What pathogen is associated with Infectious Bovine Keratoconjuncitivits/New Forest Eye/Pink eye?

A

Moraxella bovis

or Mycoplasma, pneumonia viruses

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9
Q

Is Infectious Bovine Keratoconjuncitivits/New Forest Eye/Pink eye positive or negative to fluorescein?

A

Positive

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10
Q

Name some risk factors for Infectious Bovine Keratoconjuncitivits/New Forest Eye/Pink eye

A

Flies
Woodland
Dust
UV light

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11
Q

What is the treatment forInfectious Bovine Keratoconjuncitivits/New Forest Eye/Pink eye?

A

Cloxacillin ointment
Sub-conjunctival oxytetraycline or amoxicillin
Suture eyelids closed, eye patches or keep indoors (photophobia)

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12
Q

IBR can cause ocular manifesatations. What virus causes IBR?

A

BHV-1 - latent in trigeminal

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13
Q

How is IBR diagnosed?

A

ELISA

Immunofluoresence

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14
Q

How does lead poisoning affect the eye?

A

Causes mydriasis (pupil dilation)

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15
Q

How is lead poisoning treated in catte?

A

EDTA
IV sedation
Magnesium (IM or SC)
Consider euthanasia - poor Px and long milk withdrawal

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16
Q

Listeriosis can cause encephalitis, facial paralysis and depression. What is seen on a menace test with listeria?

A

Eye retracts

17
Q

What antibiotics are used to treat listeriosis?

A

Oxytetracycline

Penicillins

18
Q

What virus causes malignant catarrhal fever?

A

Ovine herpes virus 2

19
Q

Malignant catarrhal fever is always fatal. How is it diagnosed?

A

ELISA

20
Q

Malignant catarrhal fever causes pyrexia, encephalitis and depression, nasal/mouth erosions, respiratory signs and lymph node enlargement. What eye lesions does it causes?

A

Blepharospasm
Conjunctivitis
Oedema
Centripetal corneal opacity

21
Q

How can septicaemia present in the eye? (what is the ocular manifestation for septicaemia)

A

Hypopyon - inflammatory cells in the anterior chamber

22
Q

What cow breed and age are predisposed to an ocular SCC?

A

Hereford

Older animals >5

23
Q

Occular SCC are not related to UV light and are very invasive. What is the treatment?

A

Surgical removal - may recur

Or enucleation

24
Q

Vitamin A deficiency is seen in which cows?

A

Growing indoor cattle

Fed on straw/cereal

25
Q

What are the occular manifestations of vitamin A deficiency?

A

Night blindness
Negative menace response
Dilated pupils
Oedema of optic disc

Neurology (LHW) (2 decks)

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