Exploration Strategies in Night Vision Sensors (STRAT-JVN)

The main objective of this clinical trial is to identify a variation in visual strategy characterized by both head movements and eye movements of healthy volunteers during a target detection task when images simulating night vision goggles (NVG) are presented, compared to a situation in which the images simulate a natural environment.

To highlight changes in environmental scanning with simulated images from NVG, objective measurements will be collected:

• eye movements characterized by saccades (speed, latency, and number) for each stimulus
• head movements (horizontal angle of the participant's head) for each stimulus and throughout the exposure

Participants sit facing a screen (9.90 m x 2.10 m) onto which a virtual scene is projected. The objective is to correctly identify, as quickly as possible, a target stimulus (represented by a tank) that may appear in the scene. They must use the directional arrows on a game controller to indicate whether the tank is moving to the left or to the right.

There are four visits involving four viewing conditions in which the task remains the same:

• With restricted field of view and a normal scene.
• Without restricted field of view and a scene simulating the vision obtained by NVGs.
• With restricted field of view and a scene simulating the vision obtained by NVGs.
• Without restricted field of view and a normal scene. Regarding the content of the scene, half of the tests in each visit involve a so-called poor scene when fog is simulated, or an enriched scene when there is no fog. Each visit lasts approximately one hour and thirty minutes.

Study Overview

• Status: Not yet recruiting
• Conditions: Visual Acuity

• Study Type: Observational
• Enrollment (Estimated): 10

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult; Older Adult
• Accepts Healthy Volunteers: Yes

• Sampling Method: Probability Sample

Study Population

French volunteers

Description

Inclusion Criteria:

• Affiliated with social security;
• Normal vision or vision corrected with lenses (far vision ≤ 0.03 log unit (≥ 9/10) OD/OG/binocular);
• No current or past ocular or binocular pathology: strabismus or amblyopia;
• Signed non-objection form.

Exclusion Criteria:

• Pregnant or breastfeeding women;
• Incapacitated adults;
• Individuals who do not understand French (written or spoken).

Study Plan

How is the study designed?

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Eye movements characterized by saccades (speed, latency, and number) for each stimulus	Measurements from eyetracker	Day 1 (Visit 1) and during follow-up visits at Day 2 (Visit 2), Day 3 (Visit 3), and Day 4 (Visit 4)
Head movements (horizontal angle of the participant's head) for each stimulus and throughout the exposure	Measurements extract from motion capture	Day 1 (Visit 1) and during follow-up visits at Day 2 (Visit 2), Day 3 (Visit 3), and Day 4 (Visit 4)

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
The average stimulus detection times.	Measurements from an eyetracker	Day 1 (Visit 1) and during follow-up visits at Day 2 (Visit 2), Day 3 (Visit 3), and Day 4 (Visit 4)
Number of correct responses to the perceptual task	Extract with software	Day 1 (Visit 1) and during follow-up visits at Day 2 (Visit 2), Day 3 (Visit 3), and Day 4 (Visit 4)
Visual fatigue will be measured using a questionnaire	To highlight subjective visual fatigue generated by changes in visual search strategies using simulated images from night vision sensors.	Day 1 (Visit 1) and during follow-up visits at Day 2 (Visit 2), Day 3 (Visit 3), and Day 4 (Visit 4)

Collaborators and Investigators

• Sponsor: Direction Centrale du Service de Santé des Armées

Study record dates

Study Major Dates

• Study Start (Estimated): February 1, 2026
• Primary Completion (Estimated): December 25, 2026
• Study Completion (Estimated): December 25, 2026

Study Registration Dates

• First Submitted: September 18, 2025
• First Submitted That Met QC Criteria: January 15, 2026
• First Posted (Actual): January 20, 2026

Study Record Updates

• Last Update Posted (Actual): January 20, 2026
• Last Update Submitted That Met QC Criteria: January 15, 2026
• Last Verified: January 1, 2026

More Information

Terms related to this study

• Keywords: eyetracking; visual fatigue; visual strategy; Night Vision Goggles
• Additional Relevant MeSH Terms: Eye Diseases; Asthenopia
• Other Study ID Numbers: 2025-A00047-42

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No