Unit 5: Visual Fields Flashcards

1
Q

Scotoma

A

Area where vision is partially or fully reduced

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2
Q

Ipsilateral

A

Visual field defect on the same side as lesion

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3
Q

Contralateral

A

Visual field defect on opposite side of lesion

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4
Q

Homonymous

A

Affecting the same part of the visual field of each eye

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5
Q

Hemianopia

A

Half of visual field has defect

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6
Q

Injury on the right side of the brain would affect this visual field

A

Left visual field of each eye

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7
Q

Homonymous hemianopia

A

the same half of both eyes is affected

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8
Q

Quadrantanopia

A

Quarter of the visual field scotoma

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9
Q

Central defect

A

Scotoma in the centre of the visual field

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10
Q

Arcuate defect

A

Arc shaped defect extending towards the blind spot

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11
Q

Macular sparing may occur if lesion is here

A

-More anterior part of the brain
-More peripheral fibres(?)

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12
Q

Monocular horizontal field of view

A

150 Degrees

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13
Q

Monocular superior and inferior field of view

A

60 and 50 Degrees respectively

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14
Q

Binocular view covers how many degrees centrally

A

120

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15
Q

Reasons for visual field defects

A

-Trauma
-Systemic disease
-Eye diseases

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16
Q

Reasons for conducting a visual field analysis

A

-Ophthalmic problem
-Neurological problem
-Toxic medications
-Headaches
-Unexplained reduced visual acuity
-Abnormal pupils
-Abnormal EOM movements
-Proptosis
-Elevated IOP

17
Q

Automated visual fields tests

A

-Humphrey Field analyzer
-Frequency doubling technology
-Octopus?

18
Q

Manual visual field tests

A

-Confrontation
-Tangent screen
-Goldmann
-Amsler grid

19
Q

Humphrey: 30–2

A

Central 30° with type two test points
-Used for general screening, early glaucoma and neurological conditions
-Measures 30° temporally and nasally

20
Q

Humphrey: 24–2

A

Used for general screening, early glaucoma and neurological conditions
-(Is this the same as the 30–2 test but with different numbers?)

21
Q

Humphrey: 10–2

A

More than five times as many points in the central 10° compared with the 24-2 and a 30–2

22
Q

Esterman test

A

-Tests BINOCULAR vision
-Useful for drivers test

23
Q

Frequency doubling technology

A

-Patients detect a square of flickering grating pattern
-High sensitivity
-Shorter testing time
-Doesn’t require 20/20 acuity

24
Q

False positive

A

Patient is responding even if there’s no stimulus
-“trigger happy”

25
Q

False negative

A

Patient should be able to see stimulus based on previous responses they’ve already given, but they don’t identify it.

26
Q

Fixation loss

A

When the patient is looking around to catch stimuli instead of at central point

27
Q

Glaucoma presents with this visual defect

A

-Nasal step early on
-Arcuate scotoma in more advanced cases

28
Q

Retinitis pigmentosa presents with this visual defect

A

Restricted field or ring scotoma

29
Q

Pituitary tumour presents with this visual defect

A

Bitemporal hemianopia

30
Q

Stroke presents with this visual defect

A

Varies depending on region of brain impacted

31
Q

Optic neuritis presents with this visual defect

A

Central scotoma typical but depends on where lesions are in the brain
-Associated with MS

32
Q

Optic disc drusen presents with this visual defect

A

Variable but may be arcurate scotoma