- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT05394987
Optical Correction and Visual Functions of Adults With Amblyopia (SPECTRA)
Spectacle Correction for the Treatment of Amblyopia
Study Overview
Study Type
Enrollment (Estimated)
Phase
- Not Applicable
Contacts and Locations
Study Contact
- Name: Benjamin Thompson, PhD
- Phone Number: +852-3169-9631
- Email: ben.thompson@cevr.hk
Study Contact Backup
- Name: Ken WS Tan, PhD
- Phone Number: +852-3169-9631
- Email: ken.tan@cevr.hk
Study Locations
-
-
Guangdong
-
Hong Kong, Guangdong, Hong Kong, 00000
- Recruiting
- Centre for Eye and Vision Research Limited
-
Contact:
- Peter CK Pang, PhD
- Phone Number: +852-2766-7927
- Email: csm@cevr.hk
-
Sub-Investigator:
- Adela SY Park, PhD
-
Sub-Investigator:
- Peter CK Pang, PhD
-
Sub-Investigator:
- Allen MY Cheong, PhD
-
Sub-Investigator:
- Nianzeng Zhong, PhD
-
-
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Description
Inclusion Criteria:
- 18-39 (inclusive) years of age
- Anisometropic amblyopia (difference of ≥0.50D spherical equivalent or ≥1.50D astigmatism between eyes) or mixed mechanism amblyopia (strabismus and anisometropia)
- Best corrected visual acuity (BCVA) in the amblyopic eye of 0.3 logMAR to 1.0 logMAR (inclusive)
- BCVA in the non-amblyopic eye of 0.1 logMAR or better, and an interocular VA difference of 2 logMAR lines or more
- Difference of 1.00D or more between current refractive correction and study prescription
- Good general health
Exclusion Criteria:
- Other pathological ocular anomalies known to cause reduced visual acuity
- Presbyopia (based on amplitude of accommodation)
- Inability to tolerate full refractive correction in spectacles (e.g., due to aniseikonia)
- Contraindication to cycloplegic eye drops (only when necessary for assessing residual refractive error)
- Currently under amblyopia treatment/therapy
- Inability to comprehend test instructions and/or provide consent
- Eccentric fixation and/or abnormal retinal correspondence
- >-6.00DS of myopia in either eye with spectacles
- Bilateral amblyopia
- Presence of amblyopia that is not due to strabismus and/or anisometropia
- Presence of (current or previous) attention disorder, learning disability, psychiatric, visual, or neurological disorders
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Treatment
- Allocation: N/A
- Interventional Model: Single Group Assignment
- Masking: None (Open Label)
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: Optical correction
Prescription of spectacles for full-time wear to correct refractive error
|
Prescription of refractive error correction in spectacles. Refractive error will be determined as part of a standard optometric eye exam (performed by a registered optometrist). Guidelines for optical correction for the prescription of the study spectacles (based on Pediatric Eye Disease Investigator Group [PEDIG] amblyopia clinical trial protocols): Hypermetropia - not under-corrected by more than +1.50D spherical equivalent and the reduction in plus sphere must be identical between the two eyes. Anisometropia - full correction of the anisometropic difference. Astigmatism - full cylinder power prescribed. Appropriate refractive error correction will be prescribed. Participants will be instructed to wear the optical correction full-time (i.e., more than 50% of waking hours) for the duration of the study. |
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Best corrected visual acuity of the amblyopic eye pre-intervention
Time Frame: Approx. 5 mins, baseline (day 1 of spectacle wear)
|
The size of the smallest line of letters read accurately on an ETDRS chart.
|
Approx. 5 mins, baseline (day 1 of spectacle wear)
|
Best corrected visual acuity of the amblyopic eye post-intervention
Time Frame: Approx. 5 mins, on completion of study (week 24)
|
The size of the smallest line of letters read accurately on an ETDRS chart.
|
Approx. 5 mins, on completion of study (week 24)
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Best corrected visual acuity of the amblyopic eye during intervention
Time Frame: Approx. 5 mins, every 4 weeks from start of intervention
|
The size of the smallest line of letters read accurately on an ETDRS chart.
|
Approx. 5 mins, every 4 weeks from start of intervention
|
Fellow eye distance visual acuity pre-intervention
Time Frame: Approx. 5 mins, baseline (day 1 of spectacle wear)
|
The size of the smallest line of letters read accurately on an ETDRS chart.
|
Approx. 5 mins, baseline (day 1 of spectacle wear)
|
Fellow eye distance visual acuity post-intervention
Time Frame: Approx. 5 mins, on completion of study (week 24)
|
The size of the smallest line of letters read accurately on an ETDRS chart.
|
Approx. 5 mins, on completion of study (week 24)
|
Fellow eye distance visual acuity during-intervention
Time Frame: Approx. 5 mins, every 4 weeks from start of intervention
|
The size of the smallest line of letters read accurately on an ETDRS chart.
|
Approx. 5 mins, every 4 weeks from start of intervention
|
Binocular distance visual acuity pre-intervention
Time Frame: Approx. 5 mins, baseline (day 1 of spectacle wear)
|
The size of the smallest line of letters read accurately on an ETDRS chart.
|
Approx. 5 mins, baseline (day 1 of spectacle wear)
|
Binocular distance visual acuity post-intervention
Time Frame: Approx. 5 mins, on completion of study (week 24)
|
The size of the smallest line of letters read accurately on an ETDRS chart.
|
Approx. 5 mins, on completion of study (week 24)
|
Binocular distance visual acuity during intervention
Time Frame: Approx. 5 mins, every 4 weeks from start of intervention
|
The size of the smallest line of letters read accurately on an ETDRS chart.
|
Approx. 5 mins, every 4 weeks from start of intervention
|
Near visual acuity of amblyopic eye pre-intervention
Time Frame: Approx. 5 mins, baseline (day 1 of spectacle wear)
|
The size of the smallest line of letters read accurately on a near ETDRS chart.
|
Approx. 5 mins, baseline (day 1 of spectacle wear)
|
Near visual acuity of amblyopic eye post-intervention
Time Frame: Approx. 5 mins, on completion of study (week 24)
|
The size of the smallest line of letters read accurately on a near ETDRS chart.
|
Approx. 5 mins, on completion of study (week 24)
|
Near visual acuity of amblyopic eye during intervention
Time Frame: Approx. 5 mins,every 4 weeks from start of intervention
|
The size of the smallest line of letters read accurately on a near ETDRS chart.
|
Approx. 5 mins,every 4 weeks from start of intervention
|
Near visual acuity of fellow eye pre-intervention
Time Frame: Approx. 5 mins, baseline (day 1 of spectacle wear)
|
The size of the smallest line of letters read accurately on a near ETDRS chart.
|
Approx. 5 mins, baseline (day 1 of spectacle wear)
|
Near visual acuity of fellow eye post-intervention
Time Frame: Approx. 5 mins, on completion of study (week 24)
|
The size of the smallest line of letters read accurately on a near ETDRS chart.
|
Approx. 5 mins, on completion of study (week 24)
|
Near visual acuity of fellow eye during intervention
Time Frame: Approx. 5 mins, every 4 weeks from start of intervention
|
The size of the smallest line of letters read accurately on a near ETDRS chart.
|
Approx. 5 mins, every 4 weeks from start of intervention
|
Near binocular visual acuity pre-intervention
Time Frame: Approx. 5 mins, baseline (day 1 of spectacle wear)
|
The size of the smallest line of letters read accurately on a near ETDRS chart.
|
Approx. 5 mins, baseline (day 1 of spectacle wear)
|
Near binocular visual acuity post-intervention
Time Frame: Approx. 5 mins, on completion of study (week 24)
|
The size of the smallest line of letters read accurately on a near ETDRS chart.
|
Approx. 5 mins, on completion of study (week 24)
|
Near binocular visual acuity during intervention
Time Frame: Approx. 5 mins, every 4 weeks from start of intervention
|
The size of the smallest line of letters read accurately on a near ETDRS chart.
|
Approx. 5 mins, every 4 weeks from start of intervention
|
Amblyopic eye contrast sensitivity pre-intervention
Time Frame: Approx. 10 mins, baseline (day 1 of spectacle wear)
|
Computer-based measurement of contrast sensitivity
|
Approx. 10 mins, baseline (day 1 of spectacle wear)
|
Amblyopic eye contrast sensitivity post-intervention
Time Frame: Approx. 10 mins, on completion of study (week 24)
|
Computer-based measurement of contrast sensitivity
|
Approx. 10 mins, on completion of study (week 24)
|
Amblyopic eye contrast sensitivity during intervention
Time Frame: Approx. 10 mins, every 4 weeks from start of intervention
|
Computer-based measurement of contrast sensitivity
|
Approx. 10 mins, every 4 weeks from start of intervention
|
Stereopsis pre-intervention
Time Frame: Approx. 5 mins, baseline (day 1 of spectacle wear)
|
Smallest disparity on the Randot preschool test reported accurately.
|
Approx. 5 mins, baseline (day 1 of spectacle wear)
|
Stereopsis post-intervention
Time Frame: Approx. 5 mins, on completion of study (week 24)
|
Smallest disparity on the Randot preschool test reported accurately.
|
Approx. 5 mins, on completion of study (week 24)
|
Stereopsis during intervention
Time Frame: Approx. 5 mins, every 4 weeks from start of intervention
|
Smallest disparity on the Randot preschool test reported accurately.
|
Approx. 5 mins, every 4 weeks from start of intervention
|
Angle of strabismus pre-intervention
Time Frame: Approx. 5 mins,baseline (day 1 of spectacle wear)
|
Prismatic power required to neutralise the angle of deviation on prism cover test (cover/uncover test).
|
Approx. 5 mins,baseline (day 1 of spectacle wear)
|
Angle of strabismus post-intervention
Time Frame: Approx. 5 mins, on completion of study (week 24)
|
Prismatic power required to neutralise the angle of deviation on prism cover test (cover/uncover test).
|
Approx. 5 mins, on completion of study (week 24)
|
Angle of strabismus during intervention
Time Frame: Approx. 5 mins, every 4 weeks from start of intervention
|
Prismatic power required to neutralise the angle of deviation on prism cover test (cover/uncover test).
|
Approx. 5 mins, every 4 weeks from start of intervention
|
Amblyopic eye fixation stability pre-intervention
Time Frame: Approx. 5 mins, baseline (day 1 of spectacle wear)
|
Eye position recorded with high-speed eye tracker during fixation as quantified by bivariate contour ellipse area (BCEA).
|
Approx. 5 mins, baseline (day 1 of spectacle wear)
|
Amblyopic eye fixation stability post-intervention
Time Frame: Approx. 5 mins, on completion of study (week 24)
|
Eye position recorded with high-speed eye tracker during fixation as quantified by bivariate contour ellipse area (BCEA).
|
Approx. 5 mins, on completion of study (week 24)
|
Amblyopic eye fixation stability during intervention
Time Frame: Approx. 5 mins, every 4 weeks from start of intervention
|
Eye position recorded with high-speed eye tracker during fixation as quantified by bivariate contour ellipse area (BCEA).
|
Approx. 5 mins, every 4 weeks from start of intervention
|
Fellow (non-amblyopic) eye fixation stability pre-intervention
Time Frame: Approx. 5 mins, baseline (day 1 of spectacle wear)
|
Eye position recorded with high-speed eye tracker during fixation as quantified by bivariate contour ellipse area (BCEA).
|
Approx. 5 mins, baseline (day 1 of spectacle wear)
|
Fellow (non-amblyopic) eye fixation stability post-intervention
Time Frame: Approx. 5 mins, on completion of study (week 24)
|
Eye position recorded with high-speed eye tracker during fixation as quantified by bivariate contour ellipse area (BCEA).
|
Approx. 5 mins, on completion of study (week 24)
|
Fellow (non-amblyopic) eye fixation stability during intervention
Time Frame: Approx. 5 mins, every 4 weeks from start of intervention
|
Eye position recorded with high-speed eye tracker during fixation as quantified by bivariate contour ellipse area (BCEA).
|
Approx. 5 mins, every 4 weeks from start of intervention
|
Interocular suppression pre-intervention
Time Frame: Approx. 10 mins, baseline (day 1 of spectacle wear)
|
Computer-based measurement of interocular suppression.
|
Approx. 10 mins, baseline (day 1 of spectacle wear)
|
Interocular suppression post-intervention
Time Frame: Approx. 10 mins, on completion of study (week 24)
|
Computer-based measurement of interocular suppression.
|
Approx. 10 mins, on completion of study (week 24)
|
Interocular suppression during intervention
Time Frame: Approx. 10 mins, every 4 weeks from start of intervention
|
Computer-based measurement of interocular suppression.
|
Approx. 10 mins, every 4 weeks from start of intervention
|
Quality of life pre-intervention
Time Frame: Approx.15-20 mins, baseline (day 1 of spectacle wear)
|
Questionnaire scores for:
|
Approx.15-20 mins, baseline (day 1 of spectacle wear)
|
Quality of life post-intervention
Time Frame: Approx. 15-20 mins, on completion of study (week 24)
|
Questionnaire scores for:
|
Approx. 15-20 mins, on completion of study (week 24)
|
Other Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Electrical potentials pre-intervention
Time Frame: Approx. 60 mins, baseline (day 1 of spectacle wear)
|
Electroencephalography (EEG) measures:
|
Approx. 60 mins, baseline (day 1 of spectacle wear)
|
Electrical potentials post-intervention
Time Frame: Approx. 60 mins, on completion of study (week 24)
|
Electroencephalography (EEG) measures:
|
Approx. 60 mins, on completion of study (week 24)
|
Electrical potentials during intervention
Time Frame: Approx. 60 mins, 12 weeks from baseline (day 1 of spectacle wear)
|
Electroencephalography (EEG) measures:
|
Approx. 60 mins, 12 weeks from baseline (day 1 of spectacle wear)
|
Collaborators and Investigators
Investigators
- Principal Investigator: Benjamin Thompson, PhD, Centre for Eye and Vision Research Limited
- Study Director: Ken WS Tan, PhD, Centre for Eye and Vision Research Limited
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Estimated)
Study Completion (Estimated)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Actual)
Study Record Updates
Last Update Posted (Estimated)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- SPECTRA
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
IPD Plan Description
IPD Sharing Time Frame
IPD Sharing Access Criteria
IPD Sharing Supporting Information Type
- STUDY_PROTOCOL
- SAP
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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