premyopia
Conditions
Interventions
Intervention group 1:Wearing composite defocus incorporated multi-point lenses
Intervention group 2:Wearing defocus incorporated multi-point lenses
Control group:Blank control before myopia onset
Sponsors
West China Hospital, Sichuan University
Eligibility
Sex/Gender
All
Age
6 Years to 10 Years
Inclusion criteria
Inclusion criteria: 1. Age: 6-10 years 2. -0.50D < spherical equivalent refraction (SER) = +0.75D 3. Anisometropia = 1.00D 4. Astigmatism = 1.00D 5. Having at least 1 parent with an SER in either eye of -3.00D or less 6. Having not participated in other myopia prevention and control studies, or taken other myopia prevention and control measures, including low-concentration atropine drops, peripheral defocus spectacle lenses, orthokeratology, and multifocal soft lenses within 3 months
Exclusion criteria
Exclusion criteria: 1. Accommodative insufficiency 2. Having eye diseases (e.g. cataract, strabismus, amblyopia, etc.), or having other systemic diseases or developmental abnormalities 3. Poor compliance and the researchers believe that it is not suitable to participate in this clinical trial
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| axial length;diopter; | — |
Secondary
| Measure | Time frame |
|---|---|
| crystalline lens parameters;relative peripheral refraction;choroidal parameters;visual function;visual quality questionnaire; | — |
Countries
China
Contacts
Public ContactLongqian Liu
West China Hospital, Sichuan University
Outcome results
None listed