Myopia Control Effectiveness of Second-generation Defocus Incorporated Multiple Segments Spectacle Lenses on Fast Progressing Myopes: A Randomized Controlled Trial
Trial Snapshot
- Phase
- Not Applicable
- Status
- Active, not recruiting
- Enrollment
- 118
- Locations
- 2
- Primary Endpoint
- Cycloplegic refraction change in spherical equivalent refraction (SER)
Study Overview
Brief Summary
The purpose of this study is to examine the efficacy and performance of the variant of Defocus Incorporated Spectacle lenses on controlling myopia progression in fast progressing myopic children.
Detailed Description
The variant of Defocus Incorporated Spectacle lenses (D2) is a multifocal spectacle lens that produces myopic defocus images and corrects distance refractive errors at the same time.
Participants will be randomly allocated to either single vision lens group (control) or the variant of Defocus Incorporated Spectacle lens (D2) group (treatment). After 12 months of lens wear, the SV lens prescribed to the control group will be replaced with the D2 lens and be monitored for another 36 months. In parallel, the D2 treatment groups will continue their corresponding intervention for another 36 months. Their cycloplegic refraction and axial length will be monitored every 6 months over 4 years. The changes in refractive errors and axial length in two groups will be compared.
Study Design
- Study Type
- Interventional
- Allocation
- Randomized
- Intervention Model
- Crossover
- Primary Purpose
- Treatment
- Masking
- Double (Participant, Outcomes Assessor)
Masking Description
Both participants and their guardians will be masked from the grouping. The outcomes assessors will be also masked from the grouping.
Eligibility Criteria
- Ages
- 4 Years to 12 Years (Child)
- Sex
- All
- Accepts Healthy Volunteers
- Yes
Inclusion Criteria
- •SER: -0.75D or below in both eyes
- •Documented history of fast progressing myopia, either in SER or AL
- •SER progression: 0.50D/year or more
- •AL elongation: 0.27mm/year or more
- •For children aged 4-6 years without past prescription forms,
- •4-5 years old: myopia of -0.75D or below in both eyes
- •6 years old: myopia of -1.25D or below in at least one eye, with the other eye -0.75D or below
- •Best-corrected visual acuity (VA) in both eyes:
- •4 - 6 years old: 0.20 logMAR (or its equivalent) or better
- •7-12 years old: 0.00 logMAR (or its equivalent) or better
- •Acceptance of random group allocation and the masked study design
- •Anisometropia of 1.50 D or less
- •Astigmatism of 2.00 D or less
Exclusion Criteria
- •Strabismus and binocular vision abnormalities
- •Ocular and systemic abnormalities
- •Prior experience of myopia control
Arms & Interventions
Single vision lens group
Subjects in single vision lens group will receive a pair of single vision lenses for the first year of study. They will then receive a pair of DG2 lenses for an additional 3 years.
D2 lens group
Subjects in D2 lens group will receive a pair of D2 lenses over the 4-year study.
Intervention: Variant of Defocus Incorporated Spectacle lens (DG2) (Other)
Outcomes
Primary Outcomes
Cycloplegic refraction change in spherical equivalent refraction (SER)
Time Frame: Baseline, 1st year and 2nd year
Cycloplegic SER (in diopter) will be measured using an open field autorefractor. Change in SER with cycloplegia from the baseline over a first 12-month period and a 12-month period of follow-up will be measured
Cycloplegic refraction change in spherical equivalent refraction (SER)
Time Frame: Baseline, every 6 months for 4 years
Cycloplegic SER (in diopter) will be measured using an open field autorefractor. Change in SER with cycloplegia from the baseline every 6 months for 4 years over the study period.
Secondary Outcomes
- Axial length change(Baseline, 1st year and 2nd year)
- Axial length change(Baseline, every 6 months for 4 years)