Ophtho terminology 2 Flashcards
Lacrimal system - Cornea (2) (30 cards)
Percorneal tear film
components of the tear film which include outer oily, middle aqueous, inner mucin layer
Quantitative KCS
inflamed corneal and conjunctiva 2˚ to dryness caused by impaired lacrimal gland production and decreased tear flow
Qualitative KCS
inflamed corneal and conjunctiva 2˚ to inadequate production of mucin or lipid components of percorneal tear film
Neurogenic KCS
inflamed corneal and conjunctiva 2˚ to dryness caused by loss of PSNS innervation to lacrimal glands and ipsilateral nasal mucosa
Parotid duct transposition
Sx procedure: for KCS non-responsive to medical tx
duct of salivary gland is relocated to lower conjunctival fornix and saliva is used for tear deficiency
Nasolacrimal drainage system
conduit for tear flow from external eye to the nasal cavity
Puncta, canaliculi, lacrimal sac, nasolacrimal duct
Dacryocystitis
Inflammation of the the nasolacrimal drainage system often due to obstruction from FB, infection, trauma
Oiter oily tear film source
meibomian gland
Middle aqueous film source
Lacrimal and 3rd eyelid gland
Inner mucin film source
Goblet cells :)
Facet
Loss of corneal stroma with intact overlying epithelium
Occurs because epithelization of corneal ulcer processes more rapidly that stromal healing
Corneal edema
Blue opacity - heterogenous or fluffy
Epithelial disruption
corneal ulceration
Endothelial disruption
Uveitis, glaucoma, degeneration/dystrophy
SF corneal neovascularization
response to SF diseases
Tree like vessels crossing limbus
Can coalesce to form raised granulation tissue
Deep corneal neovascularization
Deep disease disease
straight, cannot be seen crossing limbus
Dont extend as far as SF vessels
Ciliary flush
360˚ deep corneal neovascularization
Arrive from intraocular, deep origin
WBC corneal infiltration
sign of active keratitis
Painful - yellow green appreance and common in equine stromal abscess and keratomalacia (melting ulcer)
Corneal fibrosis
Scarring - stromal collage contracture, appears dull and wispy white
Ghost vessels possible
Non painful
Corneal dystrophy or degeneration
Dystrophy - corneal lipid layer appears glittery and shiny
Degeneration - calcium, appears gritty and chalky
Feline corneal sequestrium
devitalized portion of feline corneal stroma that pigments amber to black
2˚ to chronic or recurrent corneal ulceration
Keratic precipitates
cellular adhesions to the endothelium
PATHOGNOMIC for uveitis
Tiny dots from the mid portion become lager in ventral cornea
Reflux uveitis
infection inside due to processes outside
In response to complicated corneal ulcer: trigeminal N. and cytokines cause direct stimulation of ciliary body = spasm, pain, and disrupted blood ocular barrier (uveitis)
SF corneal ulceration
loss of corneal epithelium w/o loss of stroma
