{
  "abstract": "Aims To investigate the effect of switching to a different type of myopia control spectacles on myopia progression.Methods This retrospective matched-cohort study involved 1012 children or adolescents who were prescribed myopia control spectacles. Participants were divided into two groups: the change-of-type group (n=253), who switched to a different spectacle type, and the type-maintenance group (n=759), who retained the same type, using 1:3 propensity score matching. The primary outcome was the annual rate of spherical equivalent refraction progression (D/year) compared between and within groups before and after the switch.Results The initial prescription of myopia control spectacles occurred at a mean age of 9.46±2.11 years. Subsequent prescription (renewing the same type or switching to a new type) was provided at a mean age of 10.63±2.16 years. Before switching spectacles, the change-of-type group exhibited a significantly faster myopia progression rate than the type-maintenance group (−0.66±0.40 D/year vs −0.37±0.49 D/year; p<0.001). After switching, the progression rate slowed in the change-of-type group (mean reduction 0.18 D/year, p<0.001), narrowing the intergroup difference from 0.30 D/year to 0.08 D/year (−0.48±0.61 vs −0.40±0.50 D/year; p<0.001). However, the improved effect in the change-of-type group was not sustained, with myopia progression accelerating again with prolonged use (early vs late phase, −0.33 vs −0.53 D/year, p=0.024).Conclusions Switching to a different type of myopia control spectacle may help slow myopia progression for children exhibiting suboptimal response to their initial spectacles. However, this beneficial effect tends to wane over time with prolonged wear.",
  "authors": [
    {
      "affiliations": [
        "Zhongshan Ophthalmic Center, Sun Yat-sen University, WHO Collaborating Centre for Eye Care and Vision, State Key Laboratory of Ophthalmology, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangdong Basic Research Center of Excellence for Major Blinding Eye DiseasesPrevention and Treatment, Guangzhou, Guangdong, China"
      ],
      "name": "Jiaqing Zhang"
    },
    {
      "affiliations": [
        "Zhongshan Ophthalmic Center, Sun Yat-sen University, WHO Collaborating Centre for Eye Care and Vision, State Key Laboratory of Ophthalmology, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangdong Basic Research Center of Excellence for Major Blinding Eye DiseasesPrevention and Treatment, Guangzhou, Guangdong, China"
      ],
      "name": "Qianyi Pan"
    },
    {
      "affiliations": [
        "Zhongshan Ophthalmic Center, Sun Yat-sen University, WHO Collaborating Centre for Eye Care and Vision, State Key Laboratory of Ophthalmology, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangdong Basic Research Center of Excellence for Major Blinding Eye DiseasesPrevention and Treatment, Guangzhou, Guangdong, China"
      ],
      "name": "Ling Jin"
    },
    {
      "affiliations": [
        "Zhongshan Ophthalmic Center, Sun Yat-sen University, WHO Collaborating Centre for Eye Care and Vision, State Key Laboratory of Ophthalmology, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangdong Basic Research Center of Excellence for Major Blinding Eye DiseasesPrevention and Treatment, Guangzhou, Guangdong, China"
      ],
      "name": "Shiran Zhang"
    },
    {
      "affiliations": [
        "Research School of Biology, Australian National University, Canberra, Australian Capital Territory, Australia"
      ],
      "name": "Ian Morgan"
    },
    {
      "affiliations": [
        "Zhongshan Ophthalmic Center, Sun Yat-sen University, WHO Collaborating Centre for Eye Care and Vision, State Key Laboratory of Ophthalmology, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangdong Basic Research Center of Excellence for Major Blinding Eye DiseasesPrevention and Treatment, Guangzhou, Guangdong, China"
      ],
      "name": "Lixia Luo"
    },
    {
      "affiliations": [
        "Zhongshan Ophthalmic Center, Sun Yat-sen University, WHO Collaborating Centre for Eye Care and Vision, State Key Laboratory of Ophthalmology, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangdong Basic Research Center of Excellence for Major Blinding Eye DiseasesPrevention and Treatment, Guangzhou, Guangdong, China"
      ],
      "name": "Yangfa Zeng"
    },
    {
      "affiliations": [
        "Zhongshan Ophthalmic Center, Sun Yat-sen University, WHO Collaborating Centre for Eye Care and Vision, State Key Laboratory of Ophthalmology, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangdong Basic Research Center of Excellence for Major Blinding Eye DiseasesPrevention and Treatment, Guangzhou, Guangdong, China"
      ],
      "name": "Xiaotong Han"
    }
  ],
  "title": "Can switching between different types of myopia control spectacles enhance effectiveness? Findings from a real-world study",
  "uid": "6d4c2aa2-b946-5ef8-a943-58b20018f098"
}