- ICH GCP
- Rejestr badań klinicznych w USA
- Badanie kliniczne NCT07803458
Attention-based Binocular Training for Impaired Stereopsis (BRAVE) (BRAVE)
31 sierpnia 2026 zaktualizowane przez: 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.
Przegląd badań
Status
Jeszcze nie rekrutacja
Warunki
Typ studiów
Interwencyjne
Zapisy (Szacowany)
56
Faza
- Nie dotyczy
Kontakty i lokalizacje
Ta sekcja zawiera dane kontaktowe osób prowadzących badanie oraz informacje o tym, gdzie badanie jest przeprowadzane.
Kontakt w sprawie studiów
- Nazwa: Jeffrey TW Leung, PhD
- Numer telefonu: +852-64080394
- E-mail: jeffrey.tw.leung@polyu.edu.hk
Kopia zapasowa kontaktu do badania
- Nazwa: Benjamin Thompson, PhD
- Numer telefonu: +852-31699631
- E-mail: ben.thompson@cevr.hk
Lokalizacje studiów
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Hong Kong SAR
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Hong Kong, Hong Kong SAR, Hongkong, HKG
- Centre for Eye and Vision Research Limited
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Pod-śledczy:
- Tingni Li, PhD
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Pod-śledczy:
- Yu Yang
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Główny śledczy:
- Benjamin Thompson, PhD
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Kontakt:
- Benjamin Thompson, PhD
- Numer telefonu: +852-31699631
- E-mail: ben.thompson@cevr.hk
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Kontakt:
- Tingni Li, PhD
- Numer telefonu: +852-31699631
- E-mail: tingni.li@cevr.hk
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Pod-śledczy:
- Krista Kelly, PhD
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Pod-śledczy:
- Lisa Christian, PhD
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Pod-śledczy:
- Xiaofei Hu, PhD
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Pod-śledczy:
- Ken WS Tan, PhD
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Hong Kong, Hong Kong SAR, Hongkong, HKG
- The Hong Kong Polytechnic University
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Pod-śledczy:
- Allen MY Cheong, PhD
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Kontakt:
- Jeffrey TW Leung, PhD
- Numer telefonu: +852-64080394
- E-mail: jeffrey.tw.leung@polyu.edu.hk
-
Główny śledczy:
- Jeffrey TW Leung, PhD
-
-
Kryteria uczestnictwa
Badacze szukają osób, które pasują do określonego opisu, zwanego kryteriami kwalifikacyjnymi. Niektóre przykłady tych kryteriów to ogólny stan zdrowia danej osoby lub wcześniejsze leczenie.
Kryteria kwalifikacji
Wiek uprawniający do nauki
- Dorosły
Akceptuje zdrowych ochotników
Tak
Opis
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 studiów
Ta sekcja zawiera szczegółowe informacje na temat planu badania, w tym sposób zaprojektowania badania i jego pomiary.
Jak projektuje się badanie?
Szczegóły projektu
- Główny cel: Leczenie
- Przydział: Randomizowane
- Model interwencyjny: Przydział równoległy
- Maskowanie: Pojedynczy
Broń i interwencje
Grupa uczestników / Arm |
Interwencja / Leczenie |
|---|---|
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Eksperymentalny: 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.
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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.
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Aktywny komparator: 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.
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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).
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Co mierzy badanie?
Podstawowe miary wyniku
Miara wyniku |
Opis środka |
Ramy czasowe |
|---|---|---|
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Change in Local Stereoacuity
Ramy czasowe: Baseline (T0) and Immediately Post-Training (T1, within 7 days after Session 5, approximately 5-6 weeks from baseline).
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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.
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Baseline (T0) and Immediately Post-Training (T1, within 7 days after Session 5, approximately 5-6 weeks from baseline).
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Miary wyników drugorzędnych
Miara wyniku |
Opis środka |
Ramy czasowe |
|---|---|---|
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Retention of Local Stereoacuity Gains
Ramy czasowe: Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
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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
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Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
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Change in Uncrossed Local Stereoacuity
Ramy czasowe: Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
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Measured using the Randot Stereotest - Circles test with the test booklet rotated 180 degrees (log10 arcsec; nil stereopsis assigned 3000 arcsec).
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Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
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Change in Global Stereoacuity
Ramy czasowe: Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
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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).
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Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
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Change in Laboratory-Based Stereoacuity Threshold
Ramy czasowe: Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
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Psychophysical stereoacuity threshold (75% threshold in log10 arcsec) measured using a 4-alternative forced-choice staircase ring test administered dichoptically.
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Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
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Change in Best-Corrected Visual Acuity (BCVA)
Ramy czasowe: Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
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Monocular (affected/dominant eyes) and binocular distance visual acuity measured using an electronic ETDRS logMAR chart at 4 meters (recorded in logMAR units).
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Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
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Change in Interocular Suppression Status
Ramy czasowe: Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
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Binocular status classified into categorical states (fusion, suppression, or diplopia) using the Worth 4-dot test at near (40 cm) and distance (3 m).
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Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
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Change in Interocular Suppression Strength (Contrast Balance Ratio)
Ramy czasowe: Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
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Effective suppression depth quantified by the interocular contrast ratio at the perceptual balance point measured via a dichoptic letter-polarity task.
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Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
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Change in Visual Evoked Potentials (VEPs)
Ramy czasowe: Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
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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.
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Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
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Change in Electrophysiological Marker of Attentional Selection (N2pc Component)
Ramy czasowe: Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
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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.
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Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
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Change in Behavioral Selective Attention
Ramy czasowe: Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
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Spatial cueing effects on mean reaction time (ms) and response accuracy (%) derived from the modified spatial cueing task.
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Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
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Change in Visual Search Efficiency
Ramy czasowe: Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
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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.
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Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
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Change in Visuomotor Coordination Completion Time and Kinematic Parameters
Ramy czasowe: Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
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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.
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Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
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Change in Quality of Life Scores
Ramy czasowe: Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
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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.
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Baseline (T0), Immediately Post-Training (T1), and 12-Week Follow-Up (T2).
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Współpracownicy i badacze
Tutaj znajdziesz osoby i organizacje zaangażowane w to badanie.
Daty zapisu na studia
Daty te śledzą postęp w przesyłaniu rekordów badań i podsumowań wyników do ClinicalTrials.gov. Zapisy badań i zgłoszone wyniki są przeglądane przez National Library of Medicine (NLM), aby upewnić się, że spełniają określone standardy kontroli jakości, zanim zostaną opublikowane na publicznej stronie internetowej.
Główne daty studiów
Rozpoczęcie studiów (Szacowany)
1 listopada 2026
Zakończenie podstawowe (Szacowany)
31 grudnia 2028
Ukończenie studiów (Szacowany)
30 marca 2029
Daty rejestracji na studia
Pierwszy przesłany
31 sierpnia 2026
Pierwszy przesłany, który spełnia kryteria kontroli jakości
31 sierpnia 2026
Pierwszy wysłany (Rzeczywisty)
3 września 2026
Aktualizacje rekordów badań
Ostatnia wysłana aktualizacja (Rzeczywisty)
3 września 2026
Ostatnia przesłana aktualizacja, która spełniała kryteria kontroli jakości
31 sierpnia 2026
Ostatnia weryfikacja
1 sierpnia 2026
Więcej informacji
Terminy związane z tym badaniem
Dodatkowe istotne warunki MeSH
- Objawy neurologiczne
- Choroby mózgu
- Choroby ośrodkowego układu nerwowego
- Choroby Układu Nerwowego
- Choroby oczu
- Błędy refrakcji
- Zaburzenia widzenia
- Zaburzenia czucia
- Choroby nerwów czaszkowych
- Zaburzenia motoryki oka
- Stany patologiczne, oznaki i objawy
- Objawy i symptomy
- Niedowidzenie
- Zez
- Anizometropia
Inne numery identyfikacyjne badania
- RP1.4_BRAVE
Plan dla danych uczestnika indywidualnego (IPD)
Planujesz udostępniać dane poszczególnych uczestników (IPD)?
TAK
Opis planu IPD
Anonymized data will be shared on request.
Ramy czasowe udostępniania IPD
After publication of study results for an indefinite period.
Kryteria dostępu do udostępniania IPD
Upon reasonable request and approved by the study principal investigator.
Typ informacji pomocniczych dotyczących udostępniania IPD
- PROTOKÓŁ BADANIA
- SOK ROŚLINNY
Informacje o lekach i urządzeniach, dokumenty badawcze
Bada produkt leczniczy regulowany przez amerykańską FDA
Nie
Bada produkt urządzenia regulowany przez amerykańską FDA
Nie
Te informacje zostały pobrane bezpośrednio ze strony internetowej clinicaltrials.gov bez żadnych zmian. Jeśli chcesz zmienić, usunąć lub zaktualizować dane swojego badania, skontaktuj się z register@clinicaltrials.gov. Gdy tylko zmiana zostanie wprowadzona na stronie clinicaltrials.gov, zostanie ona automatycznie zaktualizowana również na naszej stronie internetowej .