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There are certain situation, when ophthalmologist is unhappy. He is unhappy when the diagnosis is not obvious. Presentation deals with the situations, when we have completely healthy eye with decreased visual acuity and no signs of pathology.
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Poor Vision
+
Healthy Eyes
Dr. Anthony28 Nov, 2013
What if?
-cornea clear-lens transparent-vitreous intact-retina intact
-optic nerve healthy-refraction corrected
- visual functions strongly decreased
DDx
-Functional (migraine, hysteria, amblyopia)
-Blood supply problems (amaurosis fugax, vertebrobasilar artery insufficiency,
ischemic optic neuropathy)- CNS damage (cortical blindness,
chiasmal tumor, epilepsy)
Migraine
Migraine
Classic signs:
PainPhotophobia, phonophobia
Nausea, vomitingPresiding visual aura
R (1)
Migraine aura
Types:
without aura (80%)with aura (10%)
aura without painretinal migraine
Migraine
Precipitating factors:
birth control pills, pregnancy, menopause, dietary (thyranine, phenylalanine, alcohol, nitrates,
nitrites, glutamate), fatigue, emotional stress, bright lights
Migraine
Work-up:
collect proper history
do CT scan in atypical case
check BP and blood sugar
Migraine
Basic Treatment:
• avoid precipitating factors• treat pain (NSAIDs, ergotamines, selective serotonine receptors agonists – triptans)• treat prophylactically in severe cases (beta-blockers, Ca-channel blockers, antidepressants, antinausea)• review in 4-6 weeks
Migraine
Hysteria
Hysteria
Classic signs:
Visual loss / blindnessno ocular pathologyno neuropathology
normal pupillary reaction
Important DDx:
Simulation, Aggravation
Hysteria
Hysteria
Exclude simulants:
NLP: torch testtest near visual acuity
test approximate visual fielduse a “strong” drops in children
Basic Treatment:
no treatment availablepsychiatrist referral may be indicated
patient often benefits from promise of good vision by next visit
review in 1-2 weeks
Hysteria
R (1)
Amblyopia
Crucial Signs:
no ocular changesno neurological changes
decreased visual acuity with refraction corrected
DDX:
diagnosis of exclusion
collect history
Amblyopia
Types:
strabismic
refractive anisometropic
deprivation
Amblyopia
Basic Treatment:
correction of refractive errorpatching of the best eye
penalization of the best eye
adults can be treated
Amblyopia
R (2)
Amblyopia
Amaurosis Fugax
(Transient Vision Loss)
Classic signs:
no ocular changes
visual loss, scotomas (seconds - hours)
monocular
Amaurosis Fugax
Amaurosis Fugax
(Transient Vision Loss)
DDx:
migraine w/o pain
Ischemic optic neuropathy
vertebrobasilar artery insufficiency
Amaurosis Fugax
(Transient Vision Loss)
Etiology:
embolus
arteriosclerotic disease (hypoperfusion)
hypercoagulable/hyperviscocity state
Amaurosis Fugax
(Transient Vision Loss)
Work-Up:
ESR, CRP, platelet count
visual field test
carotid auscultation, ultrasound
CBC, fasting blood sugar, lipid profile
ECG
Amaurosis Fugax
(Transient Vision Loss)
Tx:
carotid surgery
BP, sugar control
follow-up with physician
R (1)
Vertebrobasilar artery
insufficiency
Classic signs:
no ocular changesblurred vision (seconds)
bilateralcombined with ataxia, vertigo, dysarthria,
dysphasia, perioral numbness, hemiparesis, hemisensory loss
Cerebral Arterial Circle
Vertebrobasilar artery
insufficiency
DDx, Tx
Like in amaurosis fugax
R (1)
Cortical blindness
Clinical signs:
severe vision loss
bilateral
normal pupillary reactions
Cortical Blindness
Cortical blindness
Etiology:
infarction
tumor
infection
toxic
Cortical blindness
Work-Up:
exclude functional vision loss
exclude meningitis
BP, ECG
refer
Cortical blindness
Tx:
treat underlying cause
Ischemic Optic
Neuropathy
Certain types of ischemic optic neuropathy are “invisible” during fundoscopy: posterior ischemic
optic neuropathy.
Ischemic Optic
Neuropathy
Anterior ischemic optic neuropathy –occlusion of short posterior ciliary
artery – infarction of optic nerve head
Posterior ischemic optic neuropathy –infarction of retrolaminar portion of
optic nerve (pial capillary plexus)
Ischemic optic neuropathy
Ischemic optic neuropathyNormal disc appearance
Ischemic Optic
Neuropathy
Signs
Monocular vision loss
Sudden
Painless
Dischromatopsia
Scotoma
Ischemic Optic
Neuropathy
Work-Up
BP
blood glucose
fasting lipid profile
refer
References:
(1) The Wills Eye Manual Office and Emergency Room Diagnosis and Treatment of Eye
Disease (2008)(2) J. Kanski "Clinical Ophthalmology - A
Systematic Approach" (2011)
Thank you
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