Ophthalmic

Question 1

Which breed of sheep has a congenital ectropion?

Answer 1

Jacob

Question 2

List the aetiological differentials for blepharitis

Answer 2

Bacterial: D. congolensis, A. lignieresii, C. novyi, S. aureus
Viral: orf, ulcerative dermatosis, pox, BTV
Fungal: dermatophytosis
Parasitic: Thalazia callipaeda

Question 3

For how long is Mycoplasma conjunctivae shed post infection?

Answer 3

6 months

Question 4

Describe the signs seen in chlamydial conjunctivitis. What is the aetiological agent?

Answer 4

Follicular conjunctivitis with hyperaemia and chemosis.
Chlamydophila pecorum

Question 5

Name a risk factor for listerial conjunctivitisi/uveitis

Answer 5

Silage feeder design

Question 6

Bright blindness from bracken is caused by which toxin?

Answer 6

Ptaquiloside

Question 7

Retinal degenaration has been reported in which breed of goat?

Answer 7

Toggenburg

Question 8

Progressive retinal degenration is asociated with deficiency of which vitamin?

Answer 8

Vitamin A

Question 9

Which breed of sheep has a congenital microphthalmia?

Answer 9

Texel

Question 10

Describe the Peterson eye block. Name an alternative block

Answer 10

Halfway between lateral canthus and base of horn. Advance a curved needle caudo-medio-ventrally off the coronoid process and towards the floor of the orbit.
Four point block.