Afferent Visual System

Question 1

Sudden vision loss can be caused by what 2 things?

Answer 1

1. Vasculopathic

2. Chance Discovery

Question 2

Progressive vision loss can be caused by what 3 things?

Answer 2

1. Compressive
2. Neoplastic
3. Inflammatory

Question 3

When visual loss is due to refractive error, amblyopia, media opacity, retinal lesion, ON or chiasmal lesion.. what system is affected?

Answer 3

Afferent visual system

Question 4

What is the 1 exception to unilateral vision loss?

Answer 4

Amblyopia

Question 5

An homonymous hemianopia is a lesion that present where?

Answer 5

Between chiasm and occipital cortex

Question 6

If vision is reduced with a cataract, it will improve with ?

Answer 6

Improves with increased contrast

Question 7

If vision is reduced with amblyopia, it improves with?

Answer 7

Improves with scotopic and single letter presentation

Question 8

If vision is reduced with foveal disease, it improves with

Answer 8

improves with increased contrast

Question 9

If vision is reduced by optic nerve disease, it improves with?

Answer 9

improves with increased contrast

Question 10

What is the size of the central scotoma for these visual acuity?
a. 20/50
b. 20/100
20/200

Answer 10

a. ~ 5 deg (1.5-4.5)
b. ~ 10 deg (4-11)
c. ~20 deg (9-18)

Question 11

If a patient can see 20/20, what should their stereopsis acuity be?

Answer 11

40’

Question 12

The number on a dollar bill is what VA?

Answer 12

20/400

Question 13

The wristwatch numbers are what VA?

Answer 13

20/40-20/50

Question 14

If a patient does not improve with a pinhold, what’s the other causes of decreased VA?

Answer 14

1. Central media opacity
2. central scotoma
3. Amblyopia
4. Func. vision loss
5. Pathology

Question 15

In optic nerve disease, the color vision deficit will _____ the degree of visual loss

Answer 15

Equal

Question 16

In retinal disease, VA is ____ effected than color vision

Answer 16

Va is more effected

Question 17

If one’s VA is bad but color vision is good, what is the etiology?

Answer 17

Retinal

Question 18

If one’s VA is good and color vision is bad, what is the etiology?

Answer 18

Congenital

Question 19

If both the acuity and color vision are bad, what is the etiology?

Answer 19

Optic nerve

Question 20

If the visual field defect equals the RAPD, what is the etiology?

Answer 20

Optic Nerve Disease

Question 21

If the VF is greater than RAPD, this signifies what?

Answer 21

Significant retinal disease

Question 22

If the visual field defect is less than the RAPD, what does this signify?

Answer 22

Inaccurate field

Question 23

If there is a VF defect present and no RAPD, what does this mean?

Answer 23

Not optic nerve disease

Question 24

The RAPD is not related to what?

Answer 24

Anisocoria

• it is assoiated with;
  1. damage to afferent visual system
  2. Asymmetric disease

Question 25

An RAPD has a lesion where?

Answer 25

At or anterior to LGN ON/OC/OT)

Question 26

What are the retinal causes of RAPD?

Answer 26

1. CRAO
2. CRVO
3. RD
4. Macular disease

Question 27

What are the 5 causes of LND?

Answer 27

1. Amaurotic eye
2. Tonic pupil
3. Argyll robertson
4. Tectal/DMS
5. Aber. Reg. of CN III

Question 28

What are the subjective tests of afferent nerve functions?

Answer 28

1. Brightness comparison
2. Color vision/Desat
3. Contrast Senstivity
4. Visual Field

Question 29

What 5 things to you focus on while assessing the optic disc?

Answer 29

1. Edema
2. Pallor
3. Cupping
4. Abnormal NFL
5. Vessel abnormalities