Visual Field Testing Methods

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Questions and Answers

What is a primary feature of High-pass resolution perimetry?

Patients see rings with a light central region. (correct)

It tests only the central visual field up to 30 degrees.

It uses a dark background for stimuli presentation.

Patients identify flickering stimuli.

Why is peripheral testing important in some diseases?

It helps in identifying central scotomas.

It is crucial for diagnosing myopia.

It evaluates static vision at extreme angles.

It aids in detecting conditions like retinitis pigmentosa. (correct)

Which method is considered best for determining the shape and location of scotomas?

Automated perimetry.

Kinetic perimetry.

High-pass resolution perimetry.

Classic tangent screen and bowl perimeter examination. (correct)

What characteristic differentiates static from kinetic perimetry?

One involves moving the target across the visual field. Signup and view all the answers

What is a limitation of automated visual field testing procedures?

They may not effectively assess peripheral vision. Signup and view all the answers

What is a necessary condition during perimetric testing?

Test conditions must be documented for consistency. Signup and view all the answers

Which automated technique shows sensitivity to early losses in glaucoma?

Short wavelength automated perimetry (SWAP). Signup and view all the answers

Which aspect of visual field testing is primarily assessed through the Amsler Grid?

Central vision clarity and distortions. Signup and view all the answers

What is the primary purpose of using larger and more visible targets when frank scotomas are found?

To assess if the scotoma is absolute Signup and view all the answers

Which technique involves comparing the visual fields of a patient and a clinician?

Confrontation testing Signup and view all the answers

What should occur if there are no substantial peripheral field deficits during confrontation testing?

The target should appear and disappear at similar locations Signup and view all the answers

What is the function of the Amsler grid in visual testing?

To characterize disturbances of central vision Signup and view all the answers

What phenomenon may prevent a patient from recognizing the presence of scotomas?

Filling in effect Signup and view all the answers

When may no definite conclusion about scotomas be made during Amsler grid testing?

When no visual disturbance is observed by the patient Signup and view all the answers

Which technique is used to test more peripheral regions of the visual field?

Pseudoperimeter technique Signup and view all the answers

What is the twofold purpose of testing color vision?

To determine color perception and identify deficiencies Signup and view all the answers

What is the primary focus of automated perimetry devices in visual field testing?

Testing the central 25 to 30 degrees of the visual field Signup and view all the answers

Which testing method analyzes threshold data for patterns typical of glaucomatous field loss?

Glaucoma Hemi-field Test Signup and view all the answers

What property is the frequency-doubling perimetry test particularly sensitive to for early glaucoma detection?

Vulnerability of magnocellular nerve fibers Signup and view all the answers

How does the central visual system respond to contrast at higher spatial frequencies?

It is more sensitive to contrast variations. Signup and view all the answers

What advantage does the frequency-doubling illusion provide in visual field tests?

It aids in detecting specific neural processing vulnerabilities. Signup and view all the answers

Which characteristic is NOT assessed by graphical display printouts in visual sensitivity testing?

Trends over time in optical clarity Signup and view all the answers

In confrontation visual field testing, how is the examiner's performance most crucial?

By ensuring consistent fixation during the test. Signup and view all the answers

Which aspect of visual processing do Amsler Grid tests mainly evaluate?

Central scotoma presence Signup and view all the answers

Which factor does NOT significantly affect the visibility of stimuli in frequency-doubling perimetry testing?

Patient's age Signup and view all the answers

Study Notes

Tangent Screen & Bowl Perimeter

Larger targets are used to assess functional detection ability when scotomas are found
Coarse screening for peripheral field loss can be performed by confrontation or similar techniques
In confrontation testing, the patient’s visual field is compared with the clinician's visual field
This is done by both clinician and patient looking through a mid-point between their eyes
If no peripheral field deficits are present, the point of appearance and disappearance of the test target should be at approximately the same location for both clinician and patient
Pseudoperimeter technique is used by sweeping a target along an arc starting behind the patient
This technique helps test the peripheral regions of the field, especially in the temporal side
The Amsler grid examines central visual function and characterizes disturbances of central vision

Automated Perimetry

Short wavelength automated perimetry (SWAP) presents a large blue target on a bright yellow background
Automated perimetry procedures often involve detection of flickering stimuli, motion, or displacements
High-pass resolution perimetry presents rings with a light center and two dark circles on either side
Automated perimeters include programs that present stimuli beyond 30 degrees
Automated visual field testing procedures have advantages from consistent control of test stimuli, procedures, and the analysis of results
The classic perimetric techniques of tangent screen and bowl perimeter examination are not as commonly used today
They remain the best methods for determining scotoma shape and location
Illumination conditions must be controlled