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

Sponsor
Direction Centrale du Service de Santé des Armées (Other)
Overall Status
Not yet recruiting
CT.gov ID
NCT05243277
Collaborator
(none)
30
Enrollment
1
Location
19
Anticipated Duration (Months)
1.6
Patients Per Site Per Month

Study Details

Study Description

Brief 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.

Condition or Disease Intervention/Treatment Phase
  • Other: Oculomotor tests

Study Design

Study Type:
Observational
Anticipated Enrollment :
30 participants
Observational Model:
Cohort
Time Perspective:
Prospective
Official Title:
Oculomotor Response While Using a Helmet Display Incorporating an Accommodation-vergence Stress Reduction Algorithm
Anticipated Study Start Date :
Feb 1, 2022
Anticipated Primary Completion Date :
Sep 1, 2023
Anticipated Study Completion Date :
Sep 1, 2023

Outcome Measures

Primary Outcome Measures

  1. Evolution of oculomotor response to a stimulation generating jumps in vergence demand [Until the end of the study (20 months)]

    Oculomotor response (accommodation and vergence) will be measured continuously via a single objective system (PowerRef 3) at each visit.

Eligibility Criteria

Criteria

Ages Eligible for Study:
18 Years and Older
Sexes Eligible for Study:
All
Inclusion Criteria:

  • Age over 18

  • Non-presbyopic

  • Stereoscopic acuity ≤ 60 min of arc

Exclusion Criteria:

  • Accommodative insufficiency (APP ≤ 13-"age"/4, in diopters)

  • Accommodative inertia (+ and - block in binocular)

  • Compensation by orthokeratology

  • Present or past binocular pathology: strabismus or amblyopia

Contacts and Locations

Locations

Site City State Country Postal Code
1 Institut de Recherche Biomédicale des Armées Brétigny-sur-Orge France 91223

Sponsors and Collaborators

  • Direction Centrale du Service de Santé des Armées

Investigators

None specified.

Study Documents (Full-Text)

None provided.

More Information

Publications

None provided.
Responsible Party:
Direction Centrale du Service de Santé des Armées
ClinicalTrials.gov Identifier:
NCT05243277
Other Study ID Numbers:
  • 2021PBMD04
  • 2021-A02286-35
First Posted:
Feb 17, 2022
Last Update Posted:
Feb 17, 2022
Last Verified:
Feb 1, 2022
Individual Participant Data (IPD) Sharing Statement:
Undecided
Plan to Share IPD:
Undecided
Studies a U.S. FDA-regulated Drug Product:
No
Studies a U.S. FDA-regulated Device Product:
No
Keywords provided by Direction Centrale du Service de Santé des Armées
virtual reality
Additional relevant MeSH terms:
Asthenopia

Study Results

No Results Posted as of Feb 17, 2022