(41A) Eval of Vision Loss Flashcards Preview

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Flashcards in (41A) Eval of Vision Loss Deck (32):
1

transient vision loss in both eyes simultaneously , think

basilar artery insufficiency

2

what are amaurosis fugax?

unilateral transient loss in vision for 5 to 10 mins due to TIAs

3

sudden loss of vision in one eye in an old person (>50), think?

in a young person?

old = arterial or venous occlusion

young = optic neuritis

4

the presence of RADP usually is assc with diseases of ...

opitc N
chiasm
or optic tract anterior to the exit of the pupillary fibers

** widespread retinal dz = AV occlusive disease

5

+RAPD with normal appearing optic disc

optic neuritis

6

what does a +RAPD indicate

there is a difference in the optic nerve conduction on each side
*equal damage to both optic nerves will so NO RAPD

7

where must a lesion be found to cause scotoma in one eye

retinal or optic N

8

where must a lesion be found to cause homonymous hemianopsia

behind the chiasm (cortex)

9

where must a lesion be found to cause bitemporal hemianopsia

compression of the chiasm

10

retinal vascular lesions respect the ____ midline and optic nerve lesions the ____ midline

vascular = horizontal

optic N = central scotoma

11

young, middle age with sudden loss of vision in 1 eye + pain on motion of eye

optic neuritis

12

where is the visual field defect in a pt with optic neuritis

central (pts cannot see object when they look directly at it but can if they use their peripheral vision)

13

how is color vision affected in optic neuritis

red, color desaturation

14

scotomas move with the pts eyes or is fixed in the visual field

moves with the eyes

15

time course of optic neuritis

vision gets worse rapidly (10-14 days) and then slowly improves over 3 to 4 weeks

16

treatment of optic neuritis

GCS

17

optic disc appearance in retrobulbar ON and Papillitis

retrobulbar = optic disc nml
papillitis = disc swollen

18

how does the presentation of papilledema compare to papillitis

papilledema: nml VA, enlarged blind spot, -/+RAPD

papillitis: dec VA, central scotoma, + RAPD

19

ON is frequently seen in ...

MS

20

most common cause of a lesion to the optic chiasm

pituitary adenoma

21

homonymous hemianopsia, +RAPD, and optic atrophy

lesion between chiasm and LGN

22

homonymous hemianopsia, nml RAPD, and NO optic atrophy

lesion between LGN and cortex

23

location of lesions causing congruous vs incongruous homonymous hemianopsia

incongruous = more anterior
congruous = posterior

24

etiology of congruous homonymous hemianopsia in a young pt vs old pt

young = tumor
old = stroke
(on opposite side of field defect!!!)

25

which CN might have a palsy with papilledema

6

26

is VA affected by papilledema

no

27

signs of papilledema

hyperemic and elevated disc
blurred disc margins
tortuous and dilated vessels
hemorrhages
spontaneous venous pulsations ABSENT

28

acute loss of vision in 1 eye in an older pt
+RADP
swollen and pale disc
altitudinal hemianopsia

ischemic optic neuropathy

**looks similar to ON but in older pts

29

"cherry red spot" appearance of macula

central retinal artery occlusion

30

are optic cups large or small with optic atrophy

large

31

asymptomatic damage to the head of the optic nerve secondary to inc ICP

chronic open angle glaucoma

32

what visual field defect is seen in open angle glaucoma

peripheral then central vision loss