Myopia
Conditions
Keywords
Myopia, bifocal, children
Brief summary
1. To determine if the effect of near-addition lenses (bifocals) is more prominent for children with high myopia progression. 2. To study how different subject characteristics such as age, gender, baseline degree of myopia, baseline near phoria and baseline lag of accommodation affect the efficacy of bifocal lens wear in myopic children. 3. To investigate the effect of incorporating near base-in prisms along with the near-addition lenses (prismatic bifocals) on myopia progression in myopic children.
Interventions
DEVICEBifocal spectacles
+1.50D bifocal spectacles
DEVICEPrismatic bifocal spectacles
+1.50D bifocal spectacles combined with 3Δ base-in prisms
Sponsors
Queensland University of Technology
Essilor International
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
NONE
Eligibility
Sex/Gender
ALL
Age
8 Years to 13 Years
Healthy volunteers
Yes
Inclusion criteria
* Age: 8 to 13 years * Myopia: -1.00 to -5.00 D * Myopia progression: at least 0.50 D/yr * Astigmatism and anisometropia: not more than 1.50 D * Distance monocular visual acuity: 6/6 or better * Near monocular visual acuity: 0.4 M or better * Stereoacuity: not more than 40 sec of arc at 40 cm
Exclusion criteria
* Strabismus * Ocular diseases
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| Myopia progression, measured by cycloplegic autorefraction | Every 6 months |
Secondary
| Measure | Time frame |
|---|---|
| Axial length, measured by A-scan ultrasonography | Every 6 months |
Countries
Canada
Outcome results
None listed