Corneal Ulcers Flashcards Preview

Ophthalmology > Corneal Ulcers > Flashcards

Flashcards in Corneal Ulcers Deck (54)
Loading flashcards...
1

Damage to which facial nerve can cause the inability to blink and corneal ulceration?

Facial nerve (CN 7)

2

How long does an uncomplicated corneal ulcer take to heal?

Days (usually <5)

3

How long must a corneal ulcer be present to be considered complicated?

>7d

4

How do you treat a complicated corneal ulcer?

Conjuntival flap

5

How do you diagnose the cause of a melting corneal ulcer?

Swab for cytology and culture

6

Which feline virus can manifest in ocular signs such as conjunctivitis, ulcers, and eosinophilic keratitis?

Feline herpesvirus (feline viral rhinotracheitis)

7

What type of ulcers appear with feline herpesvirus?

Dendritic (linear)

8

How do infected corneal ulcers appear?

Melting

9

What does a melting ulcer indicate?

Deepening of ulcer into stroma

10

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)

11

How do you treat a melting corneal ulcer in a horse?

TOPICAL tobramycin (aminoglycoside) for gram neg
TOPICAL cefazolin for gram pos (Staphylococcus)

12

How might guttural pouch mycosis result in corneal ulceration?

Facial nerve paralysis

13

What are underlying causes of corneal ulcers?

Trauma, anatomical malformation, ectopic cilia, neuro deficits, inadequate tear production

14

What is ectopic cilia?

Cilia arising from palpebral conjunctiva

15

What is distichiasis?

Cilia from the meibomian gland openings @ eyelid margin

16

What is trichiasis?

Hairs from a normal location in contact w/cornea

17

What is a corneal ulcer?

Break in the corneal epithelium

18

How do you dx a corneal ulcer?

Fluorescein stain

19

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

20

What is the only type of corneal ulcer that benefits from debridement?

Spontaneous chronic corneal epithelial deficit (SCCED) - aka indolent ulcer

21

What type of uveitis does a corneal ulcer cause?

Reflex uveitis

22

What should you never use in the eye if a corneal ulcer is present?

Steroids

23

What are the three types of corneal ulceration that can be dx via the pattern of fluorescein stain uptake?

Dendritic, indolent, descemetocele

24

How will fluorescein stain uptake with a dendritic ulcer?

Linear

25

What type of dye is fluorescein stain?

Hydrophilic

26

What layer of the eye will fluorescein stain bind to?

Stroma

27

Loss of epithelium w/o stromal loss and heals in 7d or less is what type of corneal ulcer?

Simple superficial

28

What causes simple superficial corneal ulcers?

Irritants, trauma, FHV-1

29

Focal corneal edema and an ulcer margin that is very crisp indicates what type of corneal ulcer?

Superficial

30

Complicated epithelial ulcer that does not heal properly

Indolent ulcer (SCCED)