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Oculomotor Response While Using a Helmet Display Incorporating an Accommodation-vergence Stress Reduction Algorithm

NCT05243277 · Status: UNKNOWN · Type: OBSERVATIONAL · Enrollment: 30

Last updated 2023-03-28

No results posted yet for this study

Summary

Operational military personnel are increasingly using virtual or augmented reality headsets in the field or in training. However, these devices cause a conflict between accommodation (focus to see clearly) and vergence (alignment of both eyes on the object being viewed) that can be a source of visual fatigue and altered visual and perceptual abilities. Although techniques exist to limit this conflict for screen-based stimuli, the use of helmet visuals (or immersive headsets) adds technological complexity. Indeed, since accommodation on the screen of the helmet visual is impossible (i.e., distance too small) for the human visual system, lenses are used to virtually shift the image (referred to as a collimated image) so that accommodation can occur much further away. However, this material configuration also modifies the vergence, thus causing a conflict between accommodation and additional vergence that persists regardless of the attenuation technique used.

In this study, the investigator proposed to modify the image display to take into account the technical features of the helmet to correct this techno-dependent conflict. This study is aimed at determining whether the setting recommended by the algorithm developed by the investigator limits visual fatigue better than the conventional setting recommended by manufacturers or a subjective setting controlled by the user.

Conditions

  • Visual Fatigue

Interventions

OTHER

Oculomotor tests

There will be four visits. Each visit is associated with a different exposure in terms of level of oculomotor conflict. At each visit, several oculomotor tests will be performed, followed by a comfort questionnaire. The oculomotor tests are subjective tests during which the participant will be asked to fix his/her eyes on one or more targets that can move in space and to indicate the way he/she perceives this/these target(s). Depending on the test, lenses may be inserted between the participant and the target to modify his/her perception. The comfort questionnaire consists to rate on a scale of 1 (not at all) to 5 (very much) the presence of visual symptoms, such as burning, watering or dryness. The participant will then have to perform four different perceptual tasks. His/her level of accommodation (i.e. focus) will be monitored throughout the tasks. Each exposure is followed again by eye tests and a comfort questionnaire.

Sponsors & Collaborators

  • Direction Centrale du Service de Santé des Armées

    lead OTHER

Eligibility

Min Age
18 Years
Sex
ALL
Healthy Volunteers
No

Timeline & Regulatory

Start
2023-03-16
Primary Completion
2024-12-16
Completion
2024-12-16

Countries

  • France

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT05243277 on ClinicalTrials.gov