Myopia Growth Chart Based on Korean National Health and Nutrition Examination Survey – A Novel Way to Predict Myopic Progression in Childhood
Dae Hee Kim, MD1; Hyun Taek Lim, MD, PhD2
1Department of Ophthalmology, Kim’s Eye Hospital, Konyang University, Seoul, Korea
2Department of Ophthalmology, Asan Medical Center, University of Ulsan, Seoul, Korea
Introduction: To introduce a novel concept of myopia growth chart based on population-based survey for the prediction of myopic progression
Methods: This study included 7,695 subjects from 5 to 20 years of age from a population-based health survey. We collected spherical equivalent (SE) data converted from noncycloplegic refraction data. For drawing up a myopia growth chart, we sorted the SE data from hyperopia to myopia to acquire specific percentiles (the 5th, 10th, 30th, 50th, 70th, 90th, and 95th percentile) of the SE by age. We calculated myopia progression rates between specific ages in each percentile group.
Results: Mean age of the subjects was 11.8 years, mean SE was -1.82 diopters (D). The SE of the 10th percentile group was +0.72 D in 5 years of age, and -0.25 D in 20 years of age, resulting in total refraction change as -0.97 D. On the contrary, the SE of the 90th percentile group was -0.75 D in 5 years of age, and -6.73 D, showing -5.98 D of myopia progression. The myopia progression rate was estimated as -0.06 D per year, -0.15 D per year and -0.40 D per year each in the 10th, 50th and 90th percentile group from 5 to 20 years of age.
Discussion: Those who have higher percentiles of refractive error may show more rapid myopic progression.
Conclusion: Myopia growth chart may be used to predict the severity or the progression estimates in myopia. A patient having a higher percentile of myopia for his or her age may have more myopia progression rates and is needed for close observation for myopia suppression treatment.
References: 1. Chia A, Lu QS, Tan D. Five-Year Clinical Trial on Atropine for the Treatment of Myopia 2 Myopia Control with Atropine 0.01% Eyedrops. Ophthalmology. 2016;123(2):391-399. doi:10.1016/j.ophtha.2015.07.004.
2. Yoon K, Mun G, Kim S-D, et al. Prevalence of eye diseases in South Korea: data from the Korea National Health and Nutrition Examination Survey 2008-2009. Korean J Ophthalmol. 2011;25(6):421-433. doi:10.3341/kjo.2011.25.6.421.
3. Leo SW. Current approaches to myopia control. Curr Opin Ophthalmol. 2017;28(3):267-275. doi:10.1097/ICU.0000000000000367.