Visual Fields

Question 1

If you have bi-temporal (opposite sides) visual field loss where is your lesion and what is the name of this visual field deficiency

Answer 1

Lesion at the chiasm and Heteronymous

Question 2

What is a central scotoma caused by

Answer 2

inflammation of the optic disc or optic nerve

Question 3

What visual field defect will you get from a complete lesion of the left optic radiation

Answer 3

right homonymous hemianopia

Question 4

What did Leonardo DaVinci discover/realize

Answer 4

visual fields extend more than 90 degrees

Question 5

Who discovered and assigned the blind spot to the optic nerve

Answer 5

Mariotte

Question 6

What did Goldmann introduce

Answer 6

bowl perimeter

Question 7

Who is the father of classic perimetry and the “island of vision…”

Answer 7

Traquair

Question 8

on threshold visual field, what does a slip with no blind spot indicate

Answer 8

test is no good and should be repeated

Question 9

Nasal fibers represent what visual field

Answer 9

temporal

Question 10

What fibers cross at the chiasm

Answer 10

nasal fibers

Question 11

what percentage of post-chiasmal fibers continue to the Lateral Geniculate Nucleus

Answer 11

80%

Question 12

What fibers go to pre-tectal nucleus and what do they control

Answer 12

20% of the post-chiasmal fibers and they control the pupils

Question 13

What visual field defect is present when a pt has right temporal field loss and left nasal field loss

Answer 13

right hemianopsia/homonymous loss

Question 14

How many nerve fiber layers enter the Lateral Geniculate Nucleus

Answer 14

6 layers

Question 15

Which layers are for moving stimuli

Answer 15

Layers 1 and 2 (magnocellular)

Question 16

Which layers are for color, acuity, and fine detail

Answer 16

Layers 3, 4,5, and 6 (parvocellular)

Question 17

Lateral Geniculate Nucleus is a relay station sending striations to what two areas

Answer 17

temporal and parietal lobes

Question 18

Striations going to the temporal lobe travel through what area and what happens if there is a lesion here

Answer 18

Meyer’s loop, pt has pie in the sky (right or left homonymous superior quadrantanopia)

Question 19

What is the working distance for static confrontational fields

Answer 19

50-60 cm (Rx off if low Rx)

Question 20

What areas do you check with the kinetic finger counting fields

Answer 20

central 20-30 degrees, both sides of horizontal and vertical meridians

Question 21

What other gross field test can you perform

Answer 21

Facial Amsler

Question 22

Who should the Amsler Grid test be performed on

Answer 22

all patients 50 and older, all diabetics, patients with history of macular degeneration, patients on toxic medications, and patients with reduced acuities

Question 23

What 6 questions do you ask when performing the Amsler Grid test

Answer 23

1. can you see the center dot
2. are there any squares missing
3. can you see all 4 corners of the card
4. can you see all 4 sides of the card
5. are the lines straight and even
6. are any of the lines wavy or distorted

Question 24

How do you record a normal amsler grid result

Answer 24

Amsler OD: (-) scotoma (-) distortion

Question 25

At what distance is the Amsler Grid test performed at and with or without Rx

Answer 25

30cm and with Rx