An observational study in Visual Fatigue, sponsored by Direction Centrale du Service de Santé des Armées. Status unknown at 1 site in France. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2023-03-28.
Sponsored by Direction Centrale du Service de Santé des Armées · Observational
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.
67 studies on the registry are indexed under Asthenopia; 10 are open to participants now.
Browse Asthenopia studies →Direction Centrale du Service de Santé des Armées is the lead sponsor of 95 studies on the registry; 33 are open to participants now.
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The study population is composed of healthy subjectfs with no history of visual disorders.
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Exclusion Criteria:
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.
Evolution of oculomotor response to a stimulation generating jumps in vergence demand
Oculomotor response (accommodation and vergence) will be measured continuously via a single objective system (PowerRef 3) at each visit.
Time frame: Until the end of the study (20 months)
Plan to share: Undecided
No publications or documents are linked to this record.
Started Mar 2023 (actual). Primary completion is estimated for Dec 2024, 21 months after the start.
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This study is status unknown, as verified in Mar 2023. You cannot join it, but the record below documents what was studied.
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Direction Centrale du Service de Santé des Armées