myopia
Conditions
Interventions
Group 1 :Peripheral myopic defocus lenses (produce myopic defocus - 4.50D)
Group 2:Peripheral myopic defocus lenses (produce myopic defocus - 3.50D)
Group 3:Peripheral myopic defocus lenses (produce myopic defocus - 2.50D)
Group 4:Monopolitical lens
Group 5(Second Year):Peripheral myopic defocus lenses (produce myopic defocus - 4.50D) identical to the first year
Group 6(Second Year):Peripheral myopic defocus lenses (produce myopic defocus - 3.50D in first year changed to - 4.50D in second year)
Group 7(Second Year):Peripheral myopic defocus lenses (produce myopic defocus - 2.50D in first year changed to - 4.50D in second year)
Group 8(Second Year):Peripheral myopic defocus lenses (single-vision changed to produce myopic defocus - 4.50D in second year)
Group 9(External control):single vision lenses
Sponsors
West China Hospital of Sichuan University
Eligibility
Sex/Gender
All
Age
8 Years to 12 Years
Inclusion criteria
Inclusion criteria: 1. Age between 8-12 years old; 2. Myopia diopter: between -0.75-4.00D; 3. Spherical anisometropia = 1.0 (decimal recording method); 5. The refractive medium of the subject's eye is clear.
Exclusion criteria
Exclusion criteria: 1. Shallow anterior chamber or intraocular pressure > 20 mHg; 2. Suffering from keratitis, pink eye, acute inflammation around the eyes, glaucoma and other eye diseases; 3. Persons with mental retardation or mental illness; 4. Wearers of contact lenses (including those who wear contact lenses during the test); 5. Cardiopulmonary insufficiency; 6. Severe eye discomfort; 7. Wearers with insufficient adjustment; 8. The subject requests to withdraw from the clinical trial; 9. Those who have poor compliance and are considered by the investigators to be inappropriate to continue participating in this clinical trial; 10. Other myopia control methods have been used within the past year, such as orthokeratology lenses, defocused soft contact lenses, defocused frame glasses, atropine, etc.
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| spherical refraction;axial length;visual performance questionnaire;binocular vision function; | — |
Secondary
| Measure | Time frame |
|---|---|
| visual acuity;intraocular pressure;contrast sentivity;accommodative response;Peripheral refraction;choroidal thickness;choroidal vessel density;anterior chamber depth;corneal curvature;corneal thickness; lens thickness;lens power;astigmatism; vitreous chamber depth; | — |
Countries
China
Contacts
Public ContactLongqian Liu
West China hospital of Sichuan University
Outcome results
None listed