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

31 agosto 2026 aggiornato da: 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.

Panoramica dello studio

Stato

Non ancora reclutamento

Condizioni

Intervento / Trattamento

Tipo di studio

Interventistico

Iscrizione (Stimato)

56

Fase

  • Non applicabile

Contatti e Sedi

Questa sezione fornisce i recapiti di coloro che conducono lo studio e informazioni su dove viene condotto lo studio.

Contatto studio

Backup dei contatti dello studio

Luoghi di studio

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

Criteri di partecipazione

I ricercatori cercano persone che corrispondano a una certa descrizione, chiamata criteri di ammissibilità. Alcuni esempi di questi criteri sono le condizioni generali di salute di una persona o trattamenti precedenti.

Criteri di ammissibilità

Età idonea allo studio

  • Adulto

Accetta volontari sani

Sì

Descrizione

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.

Piano di studio

Questa sezione fornisce i dettagli del piano di studio, compreso il modo in cui lo studio è progettato e ciò che lo studio sta misurando.

Come è strutturato lo studio?

Dettagli di progettazione

  • Scopo principale: Trattamento
  • Assegnazione: Randomizzato
  • Modello interventistico: Assegnazione parallela
  • Mascheramento: Separare

Armi e interventi

Gruppo di partecipanti / Arm
Intervento / Trattamento
Sperimentale: 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.
Comportamentale: 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.
Comparatore attivo: 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.
Comportamentale: 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).

Cosa sta misurando lo studio?

Misure di risultato primarie

Misura del risultato
Misura Descrizione
Lasso di tempo
Change in Local Stereoacuity
Lasso di tempo: 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).

Misure di risultato secondarie

Misura del risultato
Misura Descrizione
Lasso di tempo
Retention of Local Stereoacuity Gains
Lasso di tempo: 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
Lasso di tempo: 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
Lasso di tempo: 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
Lasso di tempo: 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)
Lasso di tempo: 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
Lasso di tempo: 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)
Lasso di tempo: 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)
Lasso di tempo: 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)
Lasso di tempo: 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
Lasso di tempo: 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
Lasso di tempo: 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
Lasso di tempo: 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
Lasso di tempo: 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).

Collaboratori e investigatori

Qui è dove troverai le persone e le organizzazioni coinvolte in questo studio.

Sponsor

Centre for Eye and Vision Research

Collaboratori

The Hong Kong Polytechnic University
University of Waterloo

Studiare le date dei record

Queste date tengono traccia dell'avanzamento della registrazione dello studio e dell'invio dei risultati di sintesi a ClinicalTrials.gov. I record degli studi e i risultati riportati vengono esaminati dalla National Library of Medicine (NLM) per assicurarsi che soddisfino specifici standard di controllo della qualità prima di essere pubblicati sul sito Web pubblico.

Studia le date principali

Inizio studio (Stimato)

1 novembre 2026

Completamento primario (Stimato)

31 dicembre 2028

Completamento dello studio (Stimato)

30 marzo 2029

Date di iscrizione allo studio

Primo inviato

31 agosto 2026

Primo inviato che soddisfa i criteri di controllo qualità

31 agosto 2026

Primo Inserito (Effettivo)

3 settembre 2026

Aggiornamenti dei record di studio

Ultimo aggiornamento pubblicato (Effettivo)

3 settembre 2026

Ultimo aggiornamento inviato che soddisfa i criteri QC

31 agosto 2026

Ultimo verificato

1 agosto 2026

Maggiori informazioni

Termini relativi a questo studio

Parole chiave

Termini MeSH pertinenti aggiuntivi

Altri numeri di identificazione dello studio

  • RP1.4_BRAVE

Piano per i dati dei singoli partecipanti (IPD)

Hai intenzione di condividere i dati dei singoli partecipanti (IPD)?

SÌ

Descrizione del piano IPD

Anonymized data will be shared on request.

Periodo di condivisione IPD

After publication of study results for an indefinite period.

Criteri di accesso alla condivisione IPD

Upon reasonable request and approved by the study principal investigator.

Tipo di informazioni di supporto alla condivisione IPD

  • STUDIO_PROTOCOLLO
  • LINFA

Informazioni su farmaci e dispositivi, documenti di studio

Studia un prodotto farmaceutico regolamentato dalla FDA degli Stati Uniti

No

Studia un dispositivo regolamentato dalla FDA degli Stati Uniti

No

Queste informazioni sono state recuperate direttamente dal sito web clinicaltrials.gov senza alcuna modifica. In caso di richieste di modifica, rimozione o aggiornamento dei dettagli dello studio, contattare register@clinicaltrials.gov. Non appena verrà implementata una modifica su clinicaltrials.gov, questa verrà aggiornata automaticamente anche sul nostro sito web .

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