[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"health-studies-list:{\"conditionNormalized\":\"axial-length\",\"overallStatus\":[\"RECRUITING\",\"AVAILABLE\",\"NOT_YET_RECRUITING\"],\"orderBy\":\"LastUpdateSubmitDate:desc\",\"size\":25,\"offset\":0}":3,"health-study-condition:axial-length":27},{"pageToken":4,"total":5,"offset":6,"count":5,"results":7},null,2,0,[8,42],{"id":9,"slug":10,"hasResults":11,"nctId":12,"briefTitle":13,"officialTitle":14,"acronym":15,"eligibilityCriteria":16,"healthyVolunteers":17,"sex":18,"minAge":19,"maxAge":20,"enrollmentInfo":21,"targetDuration":4,"studyType":24,"phases":4,"briefSummary":25,"conditions":26,"keywords":4,"overallStatus":30,"whyStopped":4,"lastUpdateSubmitDate":31,"lastUpdatePostDateStruct":32,"startDateStruct":35,"completionDateStruct":37,"leadSponsor":39,"locationsCount":5},"100498469","china-axial-length-study-100498469",false,"NCT05770661","China Axial Length Study","Axial Length Study of Children and Adolescents in Ten Provinces of China","CALS","Inclusion Criteria:\n\n* Aged 3 to 18 years\n* Have been lived in the research areas for at least one year, and will not move to other places in the following two years\n* Parents or guardians sign an informed consent form, and children over 6 years old need oral consent to participate\n\nExclusion Criteria:\n\n* Mental diseases, unable to cooperate to complete the eye assessment\n* Ophthalmic diseases, inability to cooperate to complete the inspection",true,"ALL","3 Years","18 Years",{"count":22,"type":23},30000,"ESTIMATED","OBSERVATIONAL","The primary objective of this multi-center, observational study is to establish the reference ranges of axial length in Chinese children and adolescents.\n\n30,000 children aged 3-18 years were examined with cycloplegia to collect their ocular parameters and were all followed up for three years with annual visits.",[27,28,29],"Axial Length","Myopia","Child Development","RECRUITING","2025-12-11",{"date":33,"type":34},"2025-12-18","ACTUAL",{"date":36,"type":34},"2023-03-10",{"date":38,"type":23},"2026-12-31",{"name":40,"class":41},"Shanghai Eye Disease Prevention and Treatment Center","OTHER",{"id":43,"slug":44,"hasResults":11,"nctId":45,"briefTitle":46,"officialTitle":47,"acronym":4,"eligibilityCriteria":48,"healthyVolunteers":17,"sex":18,"minAge":49,"maxAge":50,"enrollmentInfo":51,"targetDuration":4,"studyType":53,"phases":54,"briefSummary":56,"conditions":57,"keywords":4,"overallStatus":58,"whyStopped":4,"lastUpdateSubmitDate":59,"lastUpdatePostDateStruct":60,"startDateStruct":62,"completionDateStruct":64,"leadSponsor":66,"locationsCount":4},"100562782","study-of-the-intervention-effect-of-outdoor-activity-period-patterns-in-promoting-myopia-among-preschool-children-100562782","NCT06607640","Study of the Intervention Effect of Outdoor Activity Period Patterns in Promoting Myopia Among Preschool Children","Study on the Association of Time Pattern of Outdoor Activity With Axial Length and Myopia of Preschool Children and Its Intervention","Inclusion Criteria:\n\n* Students and their families were informed and voluntarily participated in the study, with parents signing the informed consent form.\n* Able to cooperate with eye examinations and questionnaires.\n\nExclusion Criteria:\n\n* Communication barriers, unable to cooperate.\n* Strabismus, amblyopia, or any other ocular or systemic diseases that may affect refractive development.\n* Children currently using orthokeratology lenses or rigid contact lenses.\n* Using other interventions (such as acupuncture, massage, medication, ear acupuncture, etc.) to control myopia, apart from school eye exercises.","4 Years","5 Years",{"count":52,"type":23},210,"INTERVENTIONAL",[55],"NA","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.",[27,28],"NOT_YET_RECRUITING","2024-09-19",{"date":61,"type":34},"2024-09-23",{"date":63,"type":23},"2024-09-21",{"date":65,"type":23},"2025-12-21",{"name":67,"class":41},"Fangbiao Tao"]