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.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
PREVENTION
Masking
NONE
Enrollment
117
The lens was prescribed with 0.00 diopters
The magnitude of the central optical zone completely corrected their refractive errors under baseline cycloplegia
The lenses do not have corrective functions
Changes in the axial length
The changes in axial length of the eyes in the experimental group and the control group in the first and second years
Time frame: baseline, 6-month, 12-month, 18-month, 24-month
Change in the spherical equivalent
The changes in spherical equivalent in the experimental group and the control group in the first and second years
Time frame: Baseline, 6-month, 12-month, 18-month, 24-month
Changes in axial length
Changes in axial length from baseline to year 1 and year 2 in the plano defocus and non-plano defocus experimental groups.
Time frame: Baseline, 6-month, 12-month, 18-month, 24-month
Change in equivalent spherical
Changes in spherical equivalent refraction from baseline to year 1 and year 2 in the plano defocus and non-plano defocus experimental groups.
Time frame: Baseline, 6-month, 12-month, 18-month, 24-month
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