Flashcards in Corneal Ulcers Deck (54)
Damage to which facial nerve can cause the inability to blink and corneal ulceration?
Facial nerve (CN 7)
How long does an uncomplicated corneal ulcer take to heal?
Days (usually <5)
How long must a corneal ulcer be present to be considered complicated?
How do you treat a complicated corneal ulcer?
How do you diagnose the cause of a melting corneal ulcer?
Swab for cytology and culture
Which feline virus can manifest in ocular signs such as conjunctivitis, ulcers, and eosinophilic keratitis?
Feline herpesvirus (feline viral rhinotracheitis)
What type of ulcers appear with feline herpesvirus?
How do infected corneal ulcers appear?
What does a melting ulcer indicate?
Deepening of ulcer into stroma
What is the most common cause of bacterial keratitis that is also usually the cause of a melting corneal ulcer in horses?
Pseudomonas (gram neg rod)
How do you treat a melting corneal ulcer in a horse?
TOPICAL tobramycin (aminoglycoside) for gram neg
TOPICAL cefazolin for gram pos (Staphylococcus)
How might guttural pouch mycosis result in corneal ulceration?
Facial nerve paralysis
What are underlying causes of corneal ulcers?
Trauma, anatomical malformation, ectopic cilia, neuro deficits, inadequate tear production
What is ectopic cilia?
Cilia arising from palpebral conjunctiva
What is distichiasis?
Cilia from the meibomian gland openings @ eyelid margin
What is trichiasis?
Hairs from a normal location in contact w/cornea
What is a corneal ulcer?
Break in the corneal epithelium
How do you dx a corneal ulcer?
A particular type of superficial corneal ulcer that typically is non-healing/chronic, a hyaline acellular zone prevents the epithelium from adhering to the underlying stroma
Spontaneous chronic corneal epithelial deficits (SCCED) - aka indolent ulcer
What is the only type of corneal ulcer that benefits from debridement?
Spontaneous chronic corneal epithelial deficit (SCCED) - aka indolent ulcer
What type of uveitis does a corneal ulcer cause?
What should you never use in the eye if a corneal ulcer is present?
What are the three types of corneal ulceration that can be dx via the pattern of fluorescein stain uptake?
Dendritic, indolent, descemetocele
How will fluorescein stain uptake with a dendritic ulcer?
What type of dye is fluorescein stain?
What layer of the eye will fluorescein stain bind to?
Loss of epithelium w/o stromal loss and heals in 7d or less is what type of corneal ulcer?
What causes simple superficial corneal ulcers?
Irritants, trauma, FHV-1
Focal corneal edema and an ulcer margin that is very crisp indicates what type of corneal ulcer?