OPTHALMOLOGY 9 Flashcards
what are some anatomicla differences between cat and dog eyes?
*No eyelashes
*Deep anterior chamber
*Iris pale with visible vasculature at the periphery
*Pupil is a vertical slit: greater constriction compared to round pupil
what are some anatomicla differences between cat and dog FUNDUS?
- optic nerve head located ventral
*^ small and grey due to absence of myelin
do cats tend to have a low or high IOP during examination due to stress?
what is the normal rnage?
10-25 mmHg
high due to stress
in eyelid agenesis/colomba, which part of the eyelid is usually missing?
tx for the condition?
upper lateral
lubrication or eyelid reconstruction
are eyelid tumours usually benign or malignant
malignant
what is the most common eyelid tumour
SCC
What are some causes of UNILATERAL third eyelid protrusion?
BILATERAL?
uni: -horners syndrome
-ocular suface pain
-retrobulbar disease
bi: -bilateral from uni’s list
-haws syndrome
-dysautonomia
what are 4 infectious causes of conjuctivitis
- Chlamydophila felis
- Feline Herpes 1
- Mycoplasma
- Feline Calicivirus
infectious conjuctivitis due to chlamydophila felis will have which unique symptom?
is it more unilateral or bilateral?
gram + or gram -?
chemosis (eyelid swelling)
uni
gram -
seeing this in a cytology of conjuctivitis. likely which infective agent?
chlamydophila felis
tx of chlamydophila felis?
doxycycline
latent FHV infection is latent in the trigeminal nerve ganglia. what are 2 possible causes of re-activation?
after activation, is it usually self-lmiting?
stress & immunocompromise
yes
What type of ulcer is pathognomonic for FHV?
dendritic ulcer
describe the eye treatment for FHV PRIMARY infections
supportive:
-clean eyes
-lubricate
-antibiotics (?)
antiviral
-rare
describe the eye treatment for FHV REACTIVATED infections
[same as primary. only addition: stress management]
-antibiotic and lubricant
-stress management husbandry: litter/cardboard boxes
-antiviral treatments
What is symbelpharon?
complicaiton of FHV: Adhesions of conjunctiva or
third eyelid to each other or to
cornea
what is corneal sequestrum
common in what type of cats?
what color ocular discharge?
what does the early condition look like?
best tx?
corneal necrosis
brachycephalic cats
dark brown ocular discahrge
early: tea staining of stroma
tx: surgical excision (keratectomy)
what condition
eosinophillic keratitis
what is the appearence
and cytology of eosinophillic keratitis
- cottage cheese plaque
- eosinophils on cytology
what are 3 types of uveal neoplasia in cats?
which is msot common?
- FDIM: feline diffuse iridal melanoma (most common)
- feline intraocular sarcoma
- lymphoma
what are differences btwn iris melanosis and FDIM?
-pigment dispersion
-flat n superficial
which of the 3 feline uveal tumours is rare, highly malignant, associated with trauma
feline intraocular sarcoma
most common secondary intraocular tumour?
more commonly B or T cell?
lymphoma
B cell
most glaucoma in cats is secondary to __________
tx:
uveitis
dorzolamide (CAI) +/- timolol (beta blocker)
appearance of taurine deficient retinopathy
-retinal degeneration
-dialated cardiomyopathy
-focal hyperreflectivity
progressive retinal atrophy (PRA) is inherited in which breeds?
siamese & abyssinian
systemic hypertension (common in older cats) can lead to hypertensive retinopathy. will this cause gradual or sudden onset blindness?
hypertension is systolic bp> ______
sudden
> 170
which drug can cause irreversible retinal damage and blindness if > 5mg/kg/day given
enrofloxacin
