Eye Flashcards
Draw and label a schematic of the eye
Which structures make up the uvea? What is the function of these structures?
Iris - adjusts volume of light hitting the retina, ciliary body - lens shape, choroidea - vascular supply to the retina
What glands are associated with the eyelids?
Tarsal glands - sebaceous, Zeis - sebaceous, Moll - apocrine sweat gland, lacrimal
Anophlalmia
Absence of the eye
Microphalmia
Small sized eyes
Cyclopia
One central eye
Name an aetiological cause of cyclopia in lambs
V. californium within 14-15 days
Synophalmia
Two eyes fused into one
Dermoid
Focal nodule of skin on the cornea
Coloboma
Failure to close of the optic fissure
Aphakia
Absence of the lens
Hypopyon
Pus in the anterior chamber
Hyphaemia
Blood in the anterior chamber
Endophthalmitis
Inflammation of the internal structures of the eye
Panphthalmitis
Inflammation of all of the structures of the eye
Blepharitis
Eyelid inflammation
Internal Hordeolum
Purulent inflammation of the tarsal gland - STYE
Chalazion
Granulomatous inflammation of the tarsal gland
Dacryoadenitis
Inflammation of the lacrimal gland
Name four infectious causes of conjunctivitis.
BHV1, FHV1, Chlamidophyla psittaci, Mycoplasma felis
Describe the gross changes associated with bacterial/viral conjunctivitis.
IBR/FHV - serous-purulent +/- fibrin
Mycoplasma - pseudo-dyphteric
Chylamidophyla - unilateral
Which cause of conjunctivitis is associated with unilateral conjunctivitis in the cat?
Chylamidophyla
Describe the histological changes associated with bacterial/viral causes of conjunctivitis.
FHV - inclusion bodies in the first few days Mycoplasma - erosive, degenerative n#, coccoid bacteria Chylamidophyla - n#, mo, lpc and inclusion bodies
Name three non-infectious causes of conjunctivitis.
Dessication (
Describe the gross and histological changes associated with non-infectious conjunctivitis.
Gross - ulcerative margins Histo - Eosinophils +/- lymphocytes, hyperplasia or squamous metaplasia
Name two parasitic causes of conjunctivitis in the horse.
Draschia megastoma, Habronema microstoma
Describe the gross/ histo changes associated with parasitic conjunctivitis.
Gross - medial canthus, ulcerative nodules, oozing. Histo - granulomatous, eosinophils, larvae