Visual Field Defects Flashcards Preview

Neuroscience > Visual Field Defects > Flashcards

Flashcards in Visual Field Defects Deck (66)
Loading flashcards...
1

Left Optic Nerve

2

chiasm

(lose temporal field)

3

right optic tract (3) 

4

____ is  used to assess, diagnose, and monitor
progression of ophthalmologic and neurological conditions

Perimetry

5

What does the visual sensitivty/threshold depend on? (3)

1. age, attention level, refractive statu

2. pupil size, media opacity,

3. stimulus :size/intensity/color/duration/movement

6

Kinetic perimetry is ___

seeing motion

7

when will you see a small dull stimuli?

not until it gets to a fixation point

(as opposed to an elephant you would see immeidately)

8

static permistery involves 

object not moving but going dimmer to birghter

9

What does confrontation examination involve?

just theexaminer,no standardized method.

 

Possible strategies:
• use examiner's face
• finger counting
• finger or hand moving
• palms side by side close to midline 1
(for relative hemianopias) • red object

10

Pros of confornation visual field exam are:

its inexpensive, fast, practical

11

Cons of confornation visual field exam are:

its examiner and examinee dependent

12

General and practical rules of confrontation visual field exam are

examiner is one arm length away, showing the object half that distance

examiner closes contralateral eye

13

What does an Amsler grid test?

teststhe central 10’ of the VF


• Ptreportsanyarea missing, blurred or distorted

14

What does tangent screen test?

the central 20 ’of the VF

15

___ may be used as pseudo static stimuli

tangent screen

16

What does goldman test

almost the entire visual field

17

What is the test where the pt faces the bowl and fixates on a peep hole?

What does it measure?

1. Goldman

manualkineticbutcan also do static stimuli; tests almost entire VF. Vary stimulus sizes and intensities.

 

2. Humphrey Perimeter

automatedstatic, standardized by computer.

Plots blind spot, checks for false positives (sound only) and false negatives (stimulate known seeing area)

18

Differences between goldman perimeter and humphery perimeter?

Humphery is autonmatic static and standardized by a computer

 

Goldman is manual kinetic but can do static

depends on examiner

19

Which test tests for false positives and negatives? How does it do this? 

Humphrey

Checksforfalsepositives (sound only) and false negatives (stimulates known seeing area)

20

Define scotoma

poriton of visual field missing

21

What is arcuate? What causes it?

arc-shaped scotoma

caused from retinal nerve fiber bundle damage

22

What is an altiudinal defect?

(superior or inferior defect that respects horizontal meridian) –splits horizontally-

23

What is a hemianopia?

splits vertically (nasal or temporal defect)

24

What is a quadranopia?

can't see a quadrant

25

Homonymous means the defect is on the ___

same side ("both right visual videals are missing)

26

Congrous means the defect is

similar in both eyes (not necessary similar side?)

27

What does heternoymous mean?

defect in different sides eg bitemporal 

28

What is this?

Incomplete right eye temporal hemianopia

29

What is this?

Relative right eye temporal hemianopia

(relative/absolute is in terms of stimulus)

30

What is this?

Absolute right eye temporal hemianopia