STEEPLECHASE - EYE Flashcards
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Conjunctiva
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Normal eye fundus (5)
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Normal human fundus
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Horse - normal colour distribution
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Horse - normal central optic nerve head vein
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Horse - normal colour dilution with vortex veins visible in sclera
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Cat - normal fundus
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Cat - normal fundus
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Cat - normal visible scleral blood vessel through tapetum
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Cat - normal myelination of nerve fibre layer
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Cat - normal tigroid fundus
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Dog - normal fundus
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Dog - normal fundus
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Dog - normal fundus
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Dog - tigroid fundus
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Normal equine retina
Layers of the retina
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Micropalpebral fissure
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Macropalpebral fissure
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Entropion - external aspect of lower eyelid margin rolling inwards + rubbing cornea -> trauma
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Entropion - shar pei - conformational/congenital
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Nasal fold trichiasis - eyelashes grow inwards toward the eye + rub against the cornea, the conjunctiva, and the inner surface of the eyelid
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Blepharitis
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Puppy strangles - immune-mediated blepharitis
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Chalazion / meibomianitis - local blepharitis
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Puppy strangles - blepharitis
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Prolapsed third eyelid - pathognomic appearance
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Hyperaemic + oedematous conjunctiva
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Conjunctivitis
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Feline conjunctivitis - Chlamydophila (chlamydia) felis
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Infectious bovine keratoconjunctivitis (IBK)
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Infectious bovine keratoconjunctivitis (IBK) - caused by Moraxella bovis
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Immune-mediated keratoconjunctivitis sicca (KCS) = dry eye
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Chronic immune-mediated keratoconjunctivitis sicca (KCS)
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Immune-mediated keratoconjunctivitis sicca (KCS)
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Schirmer tear test (STT) - diagnostic for mucky/red eye, for e.g. immune-mediated keratoconjunctivitis sicca (KCS), checks tear production
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Retained spectacles
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Retained spectacles
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Normale eye cornea
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Corneal ulcer
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Corneal oedema - segmented oedema due to endothelial degeneration, hazy blue-white material
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Corneal oedema - due to infectious bovine keratoconjunctivitis (IBK)
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Corneal ulcer - caused by chemical trauma + acid spray
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Keratomalacia - melting ulcer
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Corneal ulceration
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Hole in cornea - dry eye (keratoconjunctivitis sicca) - corneal ulceration
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Inactive corneal ulcer
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Conjunctivitis w/ secondary ectopic cilia
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Ectopic cilia - causes corneal ulceration
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Feline herpesvirus - most common cause of superficial corneal ulcers in cats
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Corneal ulcer
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Lipid keratopathy
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Advanced case of extensive lipid deposition - dogue de Bordeauz
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Spontaneous chronic corneal epithelial deficit (SCCED)
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Corneal squestrum
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Corneal sequestrum
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Spontaneous Chronic Corneal Epithelial Deficit (SCCED)
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Disruption of the epithelium and stroma
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Chronic superficial keratitis (Pannus keratitis)
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Feline eosinophilic keratitis - successfully treated w/ minipill (contraceptive pill) - responds well to steroid hormone
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Persistent pupillary membrane (PPM)
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Persistent pupillary membrane (PPM)
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Uveal cysts
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Uveal cyst within iris
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Purulent - resolved uveitis, doesn’t have active inflammation, no congestion, hyperaemia, neovascularisation, blepharitis or inc blink rate. Hypopyon present = pus cells (purulent material - inflammatory cells)
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Uveitis
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Uveitis with key clinical signs
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Aqueous flare - dog, cloudiness (seen in uveitis)
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Uveitis
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Horse eye - ulcer + hyphaema in anterior chamber
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Ocular encephalitzoonosis
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Uveitis
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Due to buphthalmia (increased globe size), glaucoma lesion
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Oedema in dog, corneal lesion of glaucoma
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Glaucoma
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“Cupping” of the optic disc - a lot of pressure pushes optic nerve out
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Primary glaucoma
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Secondary glaucoma
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Pectinate ligament dysplasia
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Anterior lens luxation - lens becomes loose, popped through pupil -> plugging of pupil so aq humour can’t move through eye + drain out drainage angle -> glaucoma
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Senile nuclear sclerosis
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Cataracts
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Cataracts
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Mature cataract - pupil fully dilated, animal trying to see (can’t see through the lens)
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Cataracts - lens opacity = yellow-white, completely reflective, no light going through
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Partial luxation
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Rabbit w/ lens luxation due to chronic uveitis + catarcts
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Retinal detachment
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Retinal detachment
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Retinal detachment = hypertrophy of RPE (retinal pigment epithelium) - when photoreceptor layer becomes detached
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Collie eye anomaly/choroidal hypoplasia
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Inherited photoreceptor degeneration
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Haemorrhage due to systemic hypertension (inc blood pressure)
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SSC - primary orbital neoplasms, horse - poorly pigmented skin, UV light exposure
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Squamous cell carcinoma - cow with poorly pigmented skin
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Normal eye histo
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English Cocker Spaniel
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Lens equator - one side more rounded than the other
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Cat
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Diffuse iris melanoma
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Diffuse iris melanoma
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Small lymphocytes + plasma cells (lymphocytic + plasmacytic), uveitis
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Endophthalmitis
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(Horse)
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Cortical cataract
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Cortical cataract
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Cyst
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Cherry eye - prolapse of third eyelid, issue w/ pectinate ligament
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Cherry eye
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Cherry eye
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Keratoconjuctivitis sicca (KCS) (dry eye)
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Schirmer tear test
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Corneal ulcers
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Corneal ulcer
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Glaucoma
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Cataracts
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Cataracts
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Entropion / ectropion
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Ectropion / entropion
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Entropion
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Tacking surgery for entropion/ectropion
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Haemorrhage due to trauma following play fight of dogs
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Iris haemorrhage - clotting disorder
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Cranial trauma with globe prolapse, globe prolapse with lateral deviation indicating rupture of medial rectus, nasal haemorrhage suggesting other head pathology
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Mild conjunctival hyperaemia, dilated pupil (post chemical dilation), dense white opacity within pupil consistent with catarct
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Fibrosis and neovascularisation of cornea, pupil chemically dilated
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Squamous cell carcinoma in third eyelid, thickened and irregular surface of third eyelid with neovascularization, mucoid discharge
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White opacity in cornea with neovascularisation to affected area