Evidence map›Paper›PMID 34470605›Full record

ArticleBMC ophthalmology2021

Prevalence of myopia in 3-14-year-old Chinese children: a school-based cross-sectional study in Chengdu.

Jianglan Wang, Jinnan Liu, Wei Ma, Qi Zhang, Rong Li, Xiao He, Longqian Liu

Open access · goldAbstract read
In one paragraph

Article in BMC ophthalmology, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 28 papers.

0numbers the graph read from it
0cells of the map it votes in
28citing papers in PubMed
3.6field-weighted citation impact, top 6% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

28 citing papers in PubMed, 39 citations in OpenAlex.

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  11. Vision impairment in boys recruited to the iREAD study.Israel journal of health policy research · 2025
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  12. Innovative myopic screening platform based on smartphones.Frontiers in bioengineering and biotechnology · 2025
    Article
  13. Observational
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

7 authors at 1 institution in 1 country.

Jianglan WangDepartment of Optometry and Vision Science, West China School of Medicine, Sichuan University, 37 Guoxue Xiang, Sichuan Province, Chengdu, China.
Jinnan LiuEyeSee Medical Science & Technology Chengdu Co, Ltd. 49 Dongfu street, Jinjiang District, Chengdu, Sichuan Province, China.
Wei MaDepartment of Optometry and Vision Science, West China School of Medicine, Sichuan University, 37 Guoxue Xiang, Sichuan Province, Chengdu, China.
Qi ZhangEyeSee Medical Science & Technology Chengdu Co, Ltd. 49 Dongfu street, Jinjiang District, Chengdu, Sichuan Province, China.
Rong LiEyeSee Medical Science & Technology Chengdu Co, Ltd. 49 Dongfu street, Jinjiang District, Chengdu, Sichuan Province, China.
Xiao HeWest China Clinical Skills Training Center, West China School of Medicine/West China Hospital, Sichuan University, 37 Guoxue Xiang, Sichuan Province, 610041, Chengdu, China.
Longqian LiuDepartment of Optometry and Vision Science, West China School of Medicine, Sichuan University, 37 Guoxue Xiang, Sichuan Province, Chengdu, China. b.q15651@hotmail.com.
Sichuan University · CN

Funding

National Key Research and Development Program of China 2017YFA0701304
6 · The paper itself

Abstract

backgroundThe prevalence of myopia among children in Chengdu is unknown. The aim of this study was to determine the prevalence of myopia in 3- to 14-year-old Chinese children in Chengdu.

methodsThis study was a school-based cross-sectional study in children aged 3-14 years. Visual acuity (VA), spherical equivalent error (SER) with noncycloplegic autorefraction, axial length (AL) and corneal radius (CR) were measured.

resultsA total of 19,455 children were recruited for this study. The prevalence of myopia was 38.1 %; the prevalence of low myopia was 26.6 %, that of moderate myopia was 9.8 %, and that of high myopia was 1.7 %. The prevalence of myopia and SER increased with age from 6 years old. The prevalence of myopia was higher, and the SER indicated more severe myopia in the girls than in the boys (40.1 % vs. 36.2 %, χ

conclusionsThe prevalence of myopia, AL and AL/CR increased, and the SER became more myopic with age from 6 years old. The girls had a higher prevalence of myopia and myopic SER than did the boys, but the boys had a longer AL, flatter CR and higher AL/CR ratio than did the girls. The rate of uncorrected myopia was very high in the myopic children. More actions need to be taken to decrease the prevalence of myopia, especially uncorrected myopia in children.

Indexed as

MyopiaAdolescentChildChild, PreschoolChinaCross-Sectional StudiesFemaleHumansMalePrevalenceSchoolsaxial lengthaxial length/corneal radiusChinese childrencorneal radiusmyopic prevalencespherical equivalent error

Identifiers

PMID34470605
PMCPMC8411514
OpenAlexW3133368795

What OpenQuestion holds

Textmetadata
LicenceCC BY
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.