VF Interpretation Flashcards
Where should numbers be the greatest?
In the center, less in the periphery
What deviation plot is the most useful
Pattern deviation plot
If total deviation and pattern deviation plat are the same
Little no loss
TD plot abnormal and PD plot normal
Cataract, incorrect Rx
Normal TD nad abnormal PD plot
Trigger happy
P value less than 0.5%
Significant
+MD
Better than average
Height of the hill of vision
-MD
Less than average
Height of the hill of vision
MD=0
Normal
Height of hill of vision
What are the most common causes of artifacts
- eyelid and brow ptosis
- rim artifact
- incorrect refractive error
- patient fatigue
Eyelid and brow ptosis
Cause cause a dense superior defect along the superior edge points. Patients with visually significant ptosis may benefit from having their eyelids taped for testing
Rim artifacts in VF
The positioning of the trail lens holder can lead to a rim artifact if it is too far from the patents eye, creating a full or partial ring scotoma
Patient fatigue artifact on VF
Lobular ring or cloverleaf pattern and high false negative
Incorrect refractive error artifact on VF
Generalized depression in sensitivity that may mimic cataract. Mag or min effect
Interpretation and report of VF
- look at both fields together
- look at field in relation to other clinical findings: does the info make sense?
- evaluate reliability: make sure the data is trustworthy
- evaluate defect; type of defect
- probable diagnosis
This is crucial in the management and future monitoring for possible progression of a VF defect
Establishing a reliable baseline VF
Clinicians should _____________ to detect progressing or improvement
Obtain at least two reproducible baseline VF
Evaluating changes in VF allows the practitioner to determine what
If the condition is stable, progressing or improving
What allows the practitioner to make the necessary changes to the patient’s treatment and management plan
Statistically and clinically significant changes on the VF
When following up on patietns VF, what tests should you use
Use the same test strategy and pattern to allow easier comparison and monitoring for progression
What does enlarged blind spot mean
Optic nerve problem
What does evaluating the VF involve
Determine whether the field is normal or if any progression/improvement has occurred between two or more fields
How are fixation losses monitored
Gaze tracking
Blind spot monitor
What is the blind spot monitor
The number of times a patient responded to a target placed in the blind spot
Refers to the number of times a patient responds and no target is presented
False positive errors
Refers to the number of times a patient fails to respond to a suprathreshold target placed in a seeing area of the VF-patient does not respond to a stimulus that is brighter than what they have already seen
False neg
When is FN flagged
Above 33%
