Hyperopic Astigmatism
Conditions
Brief summary
Myopia is one of the most common visual impairments worldwide.This not only poses long-term risks to individual health but also imposes significant medical and economic burdens on society. \[6\] Therefore, delaying the onset of myopia and effectively controlling its progression has become an urgent issue that needs to be addressed.In recent years, a new type of highly aspherical lenslet (HAL) has been proposed. Its optical design includes a refractive correction area in the central region and a peripheral annular area. This annular area can form a "myopic defocus zone", increasing the myopic defocus signal around the retina. Studies have confirmed that this design can effectively slow down the progression of myopia in already myopic children. However, it is currently unclear whether this lens has a preventive effect on children who are not yet myopic but have a risk of developing myopia.
Interventions
OTHERWith-the-Rule Astigmatic Defocus Lens
The lens was prescribed with 0.00 diopters
OTHERWith-the-Rule Astigmatic Defocus Lens (Non-plano)
The magnitude of the central optical zone completely corrected their refractive errors under baseline cycloplegia
OTHERSingle Vision
The lenses do not have corrective functions
Sponsors
He Eye Hospital
He Eye Specialist Hospital
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
PREVENTION
Masking
NONE
Eligibility
Sex/Gender
ALL
Age
6 Years to 9 Years
Healthy volunteers
Yes
Inclusion criteria
* Children aged 6 to 9 with low hyperopia, regardless of gender * The refractive error is between 0 and 2.00D * The best corrected visual acuity of both eyes is ≥ 0.10 LogMAR * The subjects themselves and their guardians voluntarily participated
Exclusion criteria
* Systemic diseases or eye diseases * Received myopia control treatment through medication or optical * Any situation where participation is deemed unsuitable by the investigator
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Changes in the axial length | baseline, 6-month, 12-month, 18-month, 24-month | The changes in axial length of the eyes in the experimental group and the control group in the first and second years |
| Change in the spherical equivalent | Baseline, 6-month, 12-month, 18-month, 24-month | The changes in spherical equivalent in the experimental group and the control group in the first and second years |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Changes in axial length | Baseline, 6-month, 12-month, 18-month, 24-month | Changes in axial length from baseline to year 1 and year 2 in the plano defocus and non-plano defocus experimental groups. |
| Change in equivalent spherical | Baseline, 6-month, 12-month, 18-month, 24-month | Changes in spherical equivalent refraction from baseline to year 1 and year 2 in the plano defocus and non-plano defocus experimental groups. |
Contacts
CONTACTGuanghao Qin
Outcome results
None listed