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A Goldmann perimeter with high luminance chromatic targets

R Lakowski, W D Wright, K Oliver

Canadian Journal of Ophthalmology. Journal Canadien D'Ophtalmologie

|July 1, 1977

Summary

Researchers modified the Goldmann perimeter with new light sources for improved color perimetry. This enhanced system provides more accurate luminance levels, aiding in the comparison of visual field data.

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Area of Science:

Ophthalmology
Visual Neuroscience
Medical Instrumentation

Background:

The Goldmann perimeter is a standard tool for visual field testing.
Previous color perimetry methods had limitations in luminance control and target specification.
Discrepancies existed in findings regarding foveal scotoma for blue targets under high luminance.

Purpose of the Study:

To enhance the original Goldmann perimeter with advanced light sources.
To improve the accuracy and comparability of color perimetry measurements.
To investigate discrepancies in foveal scotoma observations.

Main Methods:

Modified the Goldmann perimeter using a Xenon arc source (3183 cd m-2 max luminance) and a quartz iodine lamp (150 cd m-2 max background luminance).
Ensured new color targets maintained comparable colorimetric and spectrophotometric specifications to the original.
Validated luminance intensities against the original system, achieving 318 cd m-2 for white targets.

Main Results:

The modified system achieved higher luminance intensities than the original Goldmann perimeter.
Chromatic profiles from the new system closely matched previous achromatic target profiles.
No relative foveal scotoma for blue targets was observed under high luminance conditions, contrasting with prior research.

Conclusions:

The enhanced Goldmann perimeter offers improved luminance control and target consistency for color perimetry.
The close correspondence between retinal threshold gradients facilitates data comparison with static perimetry.
The use of photometrically equated targets at photopic levels represents an advancement in color perimetry techniques.

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