Humphrey's visual fields interp.

Question 1

Humphrey’s Visual Fields - what does a value of 0 and a value of 50 mean?

Answer 1

• 0 means pt could not see the brightest target
• 50 means the dimmest target was seen

(most values are around 30 - any numbers below this imply a possible visual field defect)

Question 2

How would you test for fixation loss in Humphrey’s Visual Fields?

Answer 2

the machine tests the blind spot occasionally to check for fixation loss

Question 3

Humphrey’s Visual Fields - What does Total deviation show?

Answer 3

• shows deviation of pt’s result from that that of age-matched controls
• +ve means pt can see dimmer stimuli than the average
• -ve means decreased sensitivity (eg. cataract)

Question 4

Spot diagnosis + causes

Answer 4

Non-specific /low reliability / inattention - shows non-specific superior field changes in both eyes

• Causes: old, not interested, poorly positioned

Question 5

Spot diagnosis + cause

Answer 5

Cloverleaf pattern

• Cause: pt loses attention / falls asleep

Question 6

Spot diagnosis + cause/conditions can be seen in

Answer 6

Blind spot enlargement

• Can be seen in glaucoma OR papilloedema OR idiopathic intracranial hypertension (IIH)

Question 7

Spot diagnosis + condition seen in

Answer 7

Nasal step (shows an inferior nasal step)

• Characteristic of early glaucomatous field loss

Question 8

Spot diagnosis + condition seen in

Answer 8

Superior / Inferior arcuate defect - resembles an arc that comes off the blind spot which represents the loss of nerve bundles that come out of the optic disc

• Early-to-mid-stage glaucomatous field

Question 9

Spot diagnosis + condition seen in + what visual fields have been lost

Answer 9

Severe constriction with a central island

• End-stage glaucoma
• Peripheral vision is lost, but central vision remains good (6/6)

Question 10

Spot diagnosis + condition seen in

Answer 10

Superior arcuate defect - looks like an arc

• early-to-mid stage of glaucoma

Question 11

Spot diagnosis + condition seen in + what visual fields have been lost?

Answer 11

Severe constriction with a central island

• end-stage glaucoma
• most of peripheral vision gone but central vision still good (6/6)

Question 12

Spot diagnosis + condition seen in

Answer 12

Superior and inferior arcuate defects

• Glaucoma

Question 13

Spot diagnosis

Answer 13

Complete right homonymous hemianopia

• ?Stroke

Question 14

Spot diagnosis

Answer 14

Left-sided homonymous hemianopia

Question 15

Spot diagnosis

Answer 15

Dense left hemianopia with scattered inferior and superior nasal defects