Dogs vs Cats: Practical Ophthalmology for the New Graduate
Dr Ben Reynolds BVSc FCert(GerMed) MANZCVS DACVO
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A 5-year-old domestic shorthair cat presents with chronic squinting and a dark brown plaque on the central cornea. The lesion appears dry, well demarcated and slightly raised. Which diagnosis is most consistent with this presentation?
a) Corneal dystrophy
b) Corneal sequestrum
c) Keratoconjunctivitis sicca
d) Lipid keratopathy
Correct answer: (b)
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A 7-year-old cocker spaniel presents with chronic mucoid ocular discharge and conjunctival hyperaemia. Schirmer tear test values are 4 mm/min in both eyes. Which condition is most likely responsible for these findings?
a) Eosinophilic keratitis
b) Corneal sequestrum
c) Keratoconjunctivitis sicca
d) Symblepharon
Correct answer: (c)
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A 10-year-old cat presents with acute blindness. Fundic examination reveals bilateral bullous retinal detachments. Blood pressure is markedly elevated. Which underlying condition is most likely responsible?
a) Primary glaucoma
b) Systemic hypertension
c) Lens luxation
d) Primary retinal degeneration
Correct answer: (b)
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A dog presents with acute ocular pain, diffuse corneal oedema and a markedly elevated intraocular pressure. The contralateral eye has a narrow iridocorneal angle on gonioscopy. Which disease process most commonly causes this presentation in dogs but is rare in cats?
a) Primary angle-closure glaucoma
b) Uveitis
c) Corneal ulceration
d) Lens induced uveitis
Correct answer: (a)
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During ophthalmic examination of a cat, the pupil constricts to a narrow vertical slit in bright light. What is the main functional advantage of this pupil shape compared with the round pupil seen in dogs?
a) It allows a much wider range of pupil size and improved control of light entry
b) It prevents dilation in low light
c) It eliminates chromatic aberration.
d) It improves accommodation
Correct answer: (a)
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