[A description of a method for objective perimetry (author's transl)]

Area of Science:

• Ophthalmology
• Neuroscience
• Medical Imaging

Context:

• Traditional visual field testing methods can be limited by background illumination, affecting fixation control.
• Measuring the consensual pupil light reflex offers an objective indicator of visual pathway function.
• Developing novel methods for precise visual field assessment is crucial for early disease detection.

Purpose:

• To develop and evaluate a novel method for visual field testing using an infrared-sensitive TV camera.
• To assess the utility of measuring the consensual pupil light reflex for visual threshold determination.
• To compare sensory and pupillomotor thresholds in healthy volunteers.

Summary:

• An infrared-sensitive TV camera integrated into a projection perimeter allows for background-independent fixation control.
• A specialized TV processor measures and registers the consensual pupil light reflex triggered by perimeter test lights.
• Testing on four healthy volunteers measured sensory and pupillomotor thresholds on the 135-degree meridian under photopic conditions (10 asb), revealing a 10 dB difference.

Impact:

• This technology offers a more robust and objective method for visual field assessment, particularly in challenging lighting conditions.
• The findings highlight the potential of pupillomotor responses as a reliable correlate of sensory visual function.
• This approach could improve the diagnosis and monitoring of visual field defects in various neurological and ophthalmological conditions.