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Related Experiment Video

Updated: Dec 25, 2025

Measuring the Behavioral Effects of Intraocular Scatter

Measuring the Behavioral Effects of Intraocular Scatter

Published on: February 18, 2021

Validation of the driver ecological glare test.

Julien Adrian¹, David Hue², Sophie Porte²

¹Streetlab, Institut de la Vision, Paris, France.

Journal of Safety Research

|March 23, 2020

Summary

The Driver Ecological Glare Test (DEGT) effectively measures headlight glare reduction from Advanced Driver Assistance Systems (ADAS). This ecological test shows good agreement with laboratory methods for evaluating anti-glare devices for drivers.

Keywords:

Disability glare Driving Glare test Glare Halo size measurement

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Area of Science:

Ophthalmology
Automotive Engineering
Human Factors

Background:

Headlight glare from Advanced Driver Assistance Systems (ADAS) can impair driver vision.
Objective measurement tools are needed to assess the effectiveness of anti-glare technologies.

Purpose of the Study:

To validate the Driver Ecological Glare Test (DEGT) for measuring headlight glare.
To compare the DEGT with a laboratory-based glare test.

Main Methods:

Twenty-four participants (55-70 years) underwent visual examinations and halo size measurements using the Vision Monitor.
On-field nighttime testing was conducted at the UTAC CERAM test track using the DEGT for disability glare assessment.

Main Results:

A significant correlation was observed between the DEGT and the laboratory glare test.
Bland-Altman analysis indicated good agreement, with a bias of 73.7 arcmin in halo size measurements.

Conclusions:

The DEGT is a validated method for assessing halo size.
The DEGT is suitable for evaluating the effectiveness of anti-glare devices in real-world driving conditions.