Aim To prospectively determine the impact of choroidal thickness (CT) on the myopic maculopathy progression.
Methods This is a prospective, longitudinal, observational study. In total, 434 participants aged 7–70 years with bilateral high myopia (≤-6 D spherical error, range, −6 to −27.0 D) completed follow-up visits for 2 years. The baseline CT centred on the fovea was measured using a swept-source optical coherence tomography (OCT). Myopic maculopathy progression was determined by fundus photography. Logistic model was used to examine the impact of CT at baseline on the myopic maculopathy progression. Likelihood ratio test was adopted for model comparison.
Results The mean baseline age, spherical equivalence and subfoveal CT (SFCT) of the participants were 23.2±12.5 years, −10.50±3.18 D and 153.20±72.76 μm, respectively. Over 2-year’s follow-up, 74 of 434 eyes (17.1%) had myopic maculopathy progression. Baseline SFCT was thinner in eyes with myopic maculopathy progression than those without (67.26±37.67 μm vs 170.95±65.45 μm; mean difference, 99.31 μm; 95% CI 83.61 to 115.01 μm; p<0.001). The same patterns of differences were observed in 7–18 years, 19–39 years and 40–70 years. In multivariate logistic regression model, SFCT was a significant risk factor (adjusted OR=0.97, p<0.005) when age, gender, axial length and baseline myopic maculopathy category were adjusted for. The addition of SFCT significantly improved the predictive discrimination of myopic maculopathy progression in comparison with that included established risk factors alone (area under the receiver operating characteristic curve, 0.899 vs 0.942, p<0.001).
Conclusion CT is an independent predictor for myopic maculopathy progression.
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WW and RL contributed equally
Contributors MH had full access to all the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis. Study concept and design: XZL, MH. Data acquisition, analysis or interpretation: all authors. Drafting of the manuscript: XZL. Critical revision of the manuscript for important intellectual content: MH. Statistical analysis: XZL, JZ. Obtained funding: MH. Study supervision: JZ, MH.
Funding This work was supported by the National Key R&D Program of China (2018YFC0116500), Fundamental Research Funds of the State Key Laboratory of Ophthalmology, National Natural Science Foundation of China (81420108008), Science and Technology Planning Project of Guangdong Province in China (2013B20400003) and a grant from the Brien Holden Vision Institute, Australia. The sponsor or funding organisation had no role in the design or conduct of this research.
Competing interests None declared.
Provenance and peer review Not commissioned; externally peer reviewed.
Data availability statement Data are available upon reasonable request.
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