This study is a randomized controlled trial based on outdoor activity interventions at specific time periods, involving preschool children aged 4 to 5 years. It compared the axial length and myopia incidence between the intervention group and the control group at the 6th and 12th months of the intervention to determine the effect of outdoor activities at specific time periods on the prevention of myopia in preschool children. Additionally, the study investigated the association between outdoor activities at specific time periods and axial length and myopia in preschool children.
Preschool children with insufficient outdoor activity during specific time periods from one kindergarten were assigned to the intervention group, while those from another kindergarten with insufficient outdoor activity during specific time periods were assigned to the control group. The intervention group received an additional 1 hour of outdoor activity during a specific time period on each school day, while the control group did not receive any intervention and continued their regular routine. The intervention lasted for one year. Participants underwent multiple assessments after joining the study. These assessments took place at baseline, at the 6th month of the intervention, and at the 12th month.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
PREVENTION
Masking
SINGLE
Enrollment
210
The specific time periods of outdoor activity found to be beneficial for myopia prevention will be used as the intervention "target," and a one-year intervention will be initiated.
The changes in axial length (AL) and spherical equivalent (SE) compared to baseline after one year of intervention
The ocular physiological parameters, including axial length (AL), horizontal and vertical corneal curvature (K1 and K2), were measured using an optical biometer (model IOL Master 700). Each eye was measured three times, and if the difference between any two measurements exceeded 0.05 mm, the process was repeated until the difference was less than this value.An objective examination method was used under non-cycloplegic conditions (i.e., without pupil dilation), utilizing a tabletop automatic refractometer (ISO 10342-2010 Ophthalmic Instruments - Refractometers). The spherical equivalent (SE) was calculated as follows: SE = sphere power + 1/2 cylinder power.
Time frame: at baseline, at the 6th month of the intervention, and at the 12th month.
The incidence of myopia.
The incidence of myopia is defined as the occurrence of myopia in children who were not myopic at baseline.
Time frame: at baseline, at the 6th month of the intervention, and at the 12th month.
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