A Study of the Impact of Digital Intervention on Parents/primary Caregivers' Myopia Prevention and Control Health Literacy on Preschoolers' Myopia and Physical and Mental Health

Primary outcomes

1. Prevention and control of Myopia Health Literacy Rating Scale

   Time frame: 0,6month，12month

   The scale was used to assess the prevention and control of myopia health literacy of parents/primary caregivers, including 3 dimensions, 6 aspects and 31 items, each with 3 or 5 options. The forward score was 1,2,3,4,5(1,2,3) , and the reverse score was 5,4,3,2,1(3,2,1) . The scale scores ranged from 0 to 102, the higher the score, the higher the health literacy of prevention and control of myopia.

2. Myopia screening

   Time frame: 0,6month,12month

   Myopia screening includes Naked Eye Far Vision Examination, computer optometry and axial length measurement.In the state of non-ciliary paralysis, SE ≤ -0.50 D, visual acuity ≤4.7 at 3 years old, 4.8 at 4 years old, 4.9 at 5 years old, and less than 5.0 in the naked eye of children and adolescents over 6 years old were considered as screening myopia.

3. BMI

   Time frame: 0, 6month，12month

   BMI = weight (kg)/[ height (m)]2. The standard deviation method was used to evaluate the physical growth of children（WS/T 423-2022）, + 1 SD≤ age BMI ≤ + 2 SD was defined as overweight, + 2 SD ≤ age BMI≤ + 3 SD was defined as Obesity.

4. Strength and Difficulties Questionnaire

   Time frame: 0,6month,12month

   The mental health status of preschool children was evaluated by Strength and Difficulties Questionnaire, SDQ，SDQ includes 5 dimensions: emotional symptoms, conduct problems, hyperactivity problems, peer interaction problems and prosocial behaviors.The questionnaire was scored on a 3-point scale, and was evaluated from non-conformity (0 points) to full conformity (2 points) . The scale scores ranged from 0 to 40, the higher the score, the more serious the emotional and behavioral problems.