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Attention-based Binocular Training for Impaired Stereopsis (BRAVE) (BRAVE)

31 août 2026 mis à jour par: Centre for Eye and Vision Research

Binocular Recovery Through Attention-based Visual Enhancement: A Randomized Controlled Trial (BRAVE Trial)

This study evaluates a novel attention-based binocular visual search training paradigm designed to improve stereopsis (stereo vision) in individuals with impaired binocular vision. Disruptions in balanced binocular input, such as from strabismus or anisometropia, often lead to deficient stereo vision, causing daily visuomotor limitations. While traditional therapies focus on monocular acuity, they frequently fail to restore stereopsis, especially in adults. The investigators propose a unique dichoptic visual search training method that embeds binocular disparity inside an attention-demanding task, encouraging cooperative binocular integration. Participants aged 18-39 with impaired stereopsis will be randomly assigned in a 1:1 ratio to either the active training group (disparity-embeded task) or the active control group (identical task with zero disparity). Both groups complete 5 training sessions over 5-6 weeks. Assessments will occur at baseline, immediately post-training, and at a 12-week follow-up. The primary objective is to determine if the active training group shows significantly greater improvements in local stereoacuity compared to the control group.

Aperçu de l'étude

Statut

Pas encore de recrutement

Les conditions

Intervention / Traitement

Type d'étude

Interventionnel

Inscription (Estimé)

56

Phase

  • N'est pas applicable

Contacts et emplacements

Cette section fournit les coordonnées de ceux qui mènent l'étude et des informations sur le lieu où cette étude est menée.

Coordonnées de l'étude

Sauvegarde des contacts de l'étude

Lieux d'étude

  • Hong Kong
    • Hong Kong SAR
      • Hong Kong, Hong Kong SAR, Hong Kong, HKG
        • Centre for Eye and Vision Research Limited
        • Sous-enquêteur:
          • Tingni Li, PhD
        • Sous-enquêteur:
          • Yu Yang
        • Chercheur principal:
          • Benjamin Thompson, PhD
        • Contact:
        • Contact:
        • Sous-enquêteur:
          • Krista Kelly, PhD
        • Sous-enquêteur:
          • Lisa Christian, PhD
        • Sous-enquêteur:
          • Xiaofei Hu, PhD
        • Sous-enquêteur:
          • Ken WS Tan, PhD
      • Hong Kong, Hong Kong SAR, Hong Kong, HKG
        • The Hong Kong Polytechnic University
        • Sous-enquêteur:
          • Allen MY Cheong, PhD
        • Contact:
        • Chercheur principal:
          • Jeffrey TW Leung, PhD

Critères de participation

Les chercheurs recherchent des personnes qui correspondent à une certaine description, appelée critères d'éligibilité. Certains exemples de ces critères sont l'état de santé général d'une personne ou des traitements antérieurs.

Critère d'éligibilité

Âges éligibles pour étudier

  • Adulte

Accepte les volontaires sains

Oui

La description

Inclusion Criteria:

  • Aged 18-39 years (inclusive).
  • Deficient or anomalous stereoscopic vision with a stereoacuity >= 70 sec arc or unmeasurable stereoacuity.
  • Best corrected visual acuity (BCVA) of < 0.80 logMAR in both eyes, with at least one eye having a visual acuity of <= 0.1 logMAR (uncorrected or corrected-to-normal with glasses or contact lenses).
  • Normal colour vision.
  • Good general health.

Exclusion Criteria:

  • Previous history of ocular surgery (except for refractive correction surgery, where appropriate).
  • Pre-existing ocular conditions or medications that affect vision or visual function.
  • Pre-existing conditions or medications that affect neuropsychological function.
  • Presence of strabismus over 10 prism diopters at distance in current refractive correction measured by simultaneous prism and cover test, or large eccentric fixation.
  • Previous history of experiencing double vision (diplopia).
  • Identified at risk of developing diplopia due to binocular state and/or poor binocular control.
  • Inability to comprehend psychophysical test instructions given and/or consent for themselves.

Plan d'étude

Cette section fournit des détails sur le plan d'étude, y compris la façon dont l'étude est conçue et ce que l'étude mesure.

Comment l'étude est-elle conçue ?

Détails de conception

  • Objectif principal: Traitement
  • Répartition: Randomisé
  • Modèle interventionnel: Affectation parallèle
  • Masquage: Seul

Armes et Interventions

Groupe de participants / Bras
Intervention / Traitement
Expérimental: Active Training Group
Participants complete a dichoptic visual search task where the search target is uniquely paired with crossed binocular disparity under balanced interocular contrast. The training consists of 5 sessions (5 blocks of 192 trials per session) over 5-6 weeks with adaptive disparity adjustment.
Comportemental: Attention-Guided Dichoptic Visual Search Training
A computer-based dichoptic training paradigm in which visual stimuli are presented separately to each eye under balanced interocular contrast . Participants search for conjunction-defined targets across 5 sessions (5 blocks of 192 trials per session). The target stimulus is uniquely paired with crossed binocular disparity to provide depth-based attentional guidance, with target disparity adaptively reduced based on search performance.
Comparateur actif: Active Control Group
Participants perform an identical computer-based dichoptic visual search task with the same geometric stimuli, trial structure (5 blocks of 192 trials per session), and interocular contrast balancing, but with zero binocular disparity.
Comportemental: Zero-Disparity Dichoptic Visual Search Task
An active control dichoptic task identical in visual stimuli, trial structure (5 sessions; 5 blocks of 192 trials per session), and interocular contrast balancing to the training arm, but presented with zero binocular disparity (all stimuli appear in the same depth plane without depth cues).

Que mesure l'étude ?

Principaux critères de jugement

Mesure des résultats
Description de la mesure
Délai
Change in Local Stereoacuity
Délai: Baseline (T0) and Immediately Post-Training (T1, within 7 days after Session 5, approximately 5-6 weeks from baseline).
Measured using the Randot Stereotest - Circles test (graded disparities from 400 to 20 arcsec, 10 levels) under standardized lighting at 40 cm. The score is recorded as the finest disparity correctly identified (in log arcseconds). Nil stereopsis is assigned 3000 arcsec (3.477 log arcsec). The primary metric is the between-group difference in the change score.
Baseline (T0) and Immediately Post-Training (T1, within 7 days after Session 5, approximately 5-6 weeks from baseline).

Mesures de résultats secondaires

Mesure des résultats
Description de la mesure
Délai
Retention of Local Stereoacuity Gains
Délai: Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
Measured using the Randot Stereotest - Circles test under crossed disparity (log10 arcsec; nil stereopsis assigned 3000 arcsec) to evaluate long-term maintenance of training effects
Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
Change in Uncrossed Local Stereoacuity
Délai: Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
Measured using the Randot Stereotest - Circles test with the test booklet rotated 180 degrees (log10 arcsec; nil stereopsis assigned 3000 arcsec).
Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
Change in Global Stereoacuity
Délai: Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
Measured with the Randot Preschool Stereotest (random-dot stereograms, 800 to 40 arcsec, 6 levels) under both crossed and uncrossed disparity conditions (log10 arcsec; nil stereopsis assigned 3000 arcsec).
Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
Change in Laboratory-Based Stereoacuity Threshold
Délai: Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
Psychophysical stereoacuity threshold (75% threshold in log10 arcsec) measured using a 4-alternative forced-choice staircase ring test administered dichoptically.
Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
Change in Best-Corrected Visual Acuity (BCVA)
Délai: Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
Monocular (affected/dominant eyes) and binocular distance visual acuity measured using an electronic ETDRS logMAR chart at 4 meters (recorded in logMAR units).
Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
Change in Interocular Suppression Status
Délai: Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
Binocular status classified into categorical states (fusion, suppression, or diplopia) using the Worth 4-dot test at near (40 cm) and distance (3 m).
Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
Change in Interocular Suppression Strength (Contrast Balance Ratio)
Délai: Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
Effective suppression depth quantified by the interocular contrast ratio at the perceptual balance point measured via a dichoptic letter-polarity task.
Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
Change in Visual Evoked Potentials (VEPs)
Délai: Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
Peak latencies (ms) and amplitudes (μV) of the transient pattern-reversal VEP N75-P100-N135 complex across high-contrast and isoluminant red-green conditions, alongside harmonic amplitudes/phases (2F, 4F) from steady-state VEPs, recorded via a 64-channel EEG system.
Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
Change in Electrophysiological Marker of Attentional Selection (N2pc Component)
Délai: Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
Mean amplitude (μV) of the posterior contralateral-minus-ipsilateral difference wave (N2pc) extracted across predefined parieto-occipital electrodes (P7, PO7, P8, PO8) during a modified spatial cueing task.
Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
Change in Behavioral Selective Attention
Délai: Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
Spatial cueing effects on mean reaction time (ms) and response accuracy (%) derived from the modified spatial cueing task.
Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
Change in Visual Search Efficiency
Délai: Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
Visual search slope (reaction time as a function of set size, in ms/item) measured from a 192-trial zero-disparity dichoptic visual search task.
Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
Change in Visuomotor Coordination Completion Time and Kinematic Parameters
Délai: Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
Visuomotor dexterity and kinematic performance are assessed using the Grooved Pegboard Test separately for dominant and non-dominant hands. Hand movements during the task are video recorded for detailed kinematic tracking. The primary quantitative metric for this outcome is the total completion time (in seconds) required to successfully place all 25 grooved pegs (shorter duration indicates better motor speed and coordination). Secondary kinematic metrics extracted from video analyses include mean peg-insertion duration (seconds), inter-peg temporal variability across the 25 trials (coefficient of variation, CV), and total drop/error counts.
Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
Change in Quality of Life Scores
Délai: Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
Domain scores assessed via the World Health Organization Quality of Life Instrument-Short Form (WHO QoL-BREF) and the Amblyopia and Strabismus Questionnaire (A&SQ). Higher scores indicate superior functional visual ability and quality of life. For both questionnaires, domain and composite scores are linearly transformed to a standardized 0 to 100 scale, where higher scores represent superior functional visual ability, fewer daily limitations, and better overall quality of life.
Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).

Collaborateurs et enquêteurs

C'est ici que vous trouverez les personnes et les organisations impliquées dans cette étude.

Parrainer

Centre for Eye and Vision Research

Collaborateurs

The Hong Kong Polytechnic University
University of Waterloo

Dates d'enregistrement des études

Ces dates suivent la progression des dossiers d'étude et des soumissions de résultats sommaires à ClinicalTrials.gov. Les dossiers d'étude et les résultats rapportés sont examinés par la Bibliothèque nationale de médecine (NLM) pour s'assurer qu'ils répondent à des normes de contrôle de qualité spécifiques avant d'être publiés sur le site Web public.

Dates principales de l'étude

Début de l'étude (Estimé)

1 novembre 2026

Achèvement primaire (Estimé)

31 décembre 2028

Achèvement de l'étude (Estimé)

30 mars 2029

Dates d'inscription aux études

Première soumission

31 août 2026

Première soumission répondant aux critères de contrôle qualité

31 août 2026

Première publication (Réel)

3 septembre 2026

Mises à jour des dossiers d'étude

Dernière mise à jour publiée (Réel)

3 septembre 2026

Dernière mise à jour soumise répondant aux critères de contrôle qualité

31 août 2026

Dernière vérification

1 août 2026

Plus d'information

Termes liés à cette étude

Mots clés

Termes MeSH pertinents supplémentaires

Autres numéros d'identification d'étude

  • RP1.4_BRAVE

Plan pour les données individuelles des participants (IPD)

Prévoyez-vous de partager les données individuelles des participants (DPI) ?

OUI

Description du régime IPD

Anonymized data will be shared on request.

Délai de partage IPD

After publication of study results for an indefinite period.

Critères d'accès au partage IPD

Upon reasonable request and approved by the study principal investigator.

Type d'informations de prise en charge du partage d'IPD

  • PROTOCOLE D'ÉTUDE
  • SÈVE

Informations sur les médicaments et les dispositifs, documents d'étude

Étudie un produit pharmaceutique réglementé par la FDA américaine

Non

Étudie un produit d'appareil réglementé par la FDA américaine

Non

Ces informations ont été extraites directement du site Web clinicaltrials.gov sans aucune modification. Si vous avez des demandes de modification, de suppression ou de mise à jour des détails de votre étude, veuillez contacter register@clinicaltrials.gov. Dès qu'un changement est mis en œuvre sur clinicaltrials.gov, il sera également mis à jour automatiquement sur notre site Web .

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