Myopia prevention in Taiwan
Review Article

Myopia prevention in Taiwan

Pei-Chang Wu1, Li-Chun Chang2, Yu-Zhen Niu3, Min-Li Chen4, Li-Ling Liao5, Chueh-Tan Chen1

1Department of Ophthalmology, Kaohsiung Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Kaohsiung; 2Department of Nursing, Chang Gung University of Science and Technology, Tao-Yuan; 3Sanitary and Health Caring Center, National Chiao Tung University, Hsinchu; 4Department of Respiratory Care, Chang Gung University of Science and Technology, Chiayi; 5Department of Health Management, I-Shou University, Kaohsiung

Contributions: (I) Conception and design: PC Wu; (II) Administrative support: LC Chang, YZ Niu, ML Chen, LL Liao; (III) Provision of study materials or patients: CT Chen; (IV) Collection and assembly of data: CT Chen, PC Wu; (V) Data analysis and interpretation: PC Wu, CT Chen; (VI) Manuscript writing: All authors: (VII) Final approval of manuscript: All authors.

Correspondence to: Chueh-Tan Chen, MS. Department of Ophthalmology, Kaohsiung Chang Gung Memorial Hospital, 123 Dapi Road, Niaosong Dist., Kaohsiung 88301. Email: chuehtan@hotmail.com.

Abstract: Complications of myopia have become an important public health issue with serious socio-economic burdens. Prevention and treatment are both important. The Taiwan Student Vision Care Program (TSVCP) promoted by Ministry of Education (MOE) has been carried out for 3 decades in Taiwan. The myopia prevalence has increased rapidly to a high level and therefore myopia prevention has continued to be the most important item in the program. Therefore, TSVCP aims to decrease the prevalence of myopia, in order to decrease the high myopia related blindness in the future. Recently, outdoor activity has been found to be an important protective factor for myopia and was implemented in TSVCP since 2010. Afterwards, the nationwide vision impairment rate (uncorrected vision 20/25 or less) of elementary school students declined unprecedentedly and continuously in recent years. Evidence-based protective and risk factors for myopia are now clearer. Widespread acknowledgement of myopic disease, preventing the onset of myopia, prompt diagnosis, and early treatment to control progression are all important.

Keywords: Myopia; outdoor; near work; schoolchildren


Received: 12 July 2017; Accepted: 18 January 2018; Published: 26 February 2018.

doi: 10.21037/aes.2018.01.05


Over 22% of the global population has myopia, which affects 1.5 billion people (1). Around one fifth to one quarter of myopic people has high myopia (1,2). Myopia is not to be considered a simple refractive error, but should be considered as a disease because it increases the risk of serious eye disorders, such as retinal detachment, cataract, glaucoma, maculopathy, and even irreversible blindness (3-5). High myopia maculopathy is the number one cause of irreversible blindness in Taiwan, Japan, and China (6-8). In the West, it is the third leading cause of blindness in Denmark, the Netherlands, and in the Latino American population (9-11). Chauvaud has proposed that high myopia is a blinding orphan because most of the complications of myopia are incurable (12). Therefore, the prevention of myopia is an important public health issue.

In Taiwan, the government has paid much attention to the vision care of students starting from 30 years ago. The Taiwan Student Vision Care Program (TSVCP) is continued promoted by Ministry of Education (MOE). From 1980, the Executive Yuan considered myopia to be a serious public health issue and instructed relevant departments, including the MOE and the Department of Health (DOH) to initiate “enhancing important measures of student vision care”. Nationwide student vision screenings and referrals by school nurses were routinely performed each semester. In 1986, the DOH supported grants to set the center of child vision care in five medical centers to initiate myopia prevention and treatment. In addition, the DOH granted the “Epidemiology study of cycloplegic refraction status of 6–18 years old students in Taiwan” every 5 years. In 1995, the DOH promoted random dot stereopsis tests and vision screening for amblyopia and strabismus screening in 5 years old preschool children. In 1999, the Executive Yuan led the MOE, DOH, Ministry of the Interior, and associated departments to conduct “enhancing schoolchildren vision care—5 year program”. In 2007–2009, MOE granted the “schoolchildren and pre-schooler vision care program”. In 2010, MOE granted the “schoolchildren and pre-schooler vision care—3 year program”. From 2014 to the present, MOE granted the “schoolchildren vision care program”.

In the period of the “enhancing schoolchildren vision care—5 year program” (1999–2004), amblyopia & strabismus in kindergarten achieved a 95% population screen. Vision impairment referrals of over 80% were achieved. Both items achieved preset goals. During this period, the key items for myopia prevention included improving room lighting, adjusting table heights for individual students, encouraging distance gazing, eye exercise and promoting near work breaks. Even though this required significant manpower and budget, the results were still unsatisfactory. From the nationwide survey in 2006, myopia prevalence was 19.6% in 7 year-old students and 61.8% in 12 year-old students (13). Myopia prevalence was still high in compared to year 2000, 20.4% in 7 year-old students and 60.6% in 12 year-old students. The reason might be lack of strong evidence based strategies for myopia prevention at that time. The vision impairment rate of primary school in Taiwan also increased according to a MOE report. The vision impairment rate (cut-off point is Snellen visual acuity 20/25 or less) was considered to be high correlated with myopia prevalence (14,15). Despite great promotion of this 5-year program over 3,000 schools, the state of myopia in Taiwan still worsened. Most teachers were frustrated and considered the high prevalence of myopia as predestined in Taiwan.

In 1986, the myopia prevalence of 7 years old children was only 3%, but rose to 21% in 2010 (13). Over 60% of 12 years old students and over 85% of 18 years old high school students were myopic. The high myopia prevalence in 18 years old population increased from 9.2% in 1986 to 20.8% in 2000. Shih reported the effectiveness of atropine on myopia progression in Taiwanese schoolchildren in 1999 (16). Then, a large number of myopic children were prescribed the atropine eye drop treatment for myopia control (17). Thereafter in 2006, the high myopia prevalence in 18 years old slightly decreased to 16.9%.

After 2007–2009 when the “schoolchildren and pre-schooler vision care program” was performed, the vision impairment rate was still increasing almost up to 50% (Figure 1). In 2007, Jones et al. reported that 14 hours outdoors per week could reverse the risk of myopia due to parental myopia (18). In 2008, Rose et al. published an important paper about outdoor activity reducing the prevalence of myopia in children (19). Saw provided Singapore’s data compared to a Sydney myopia study that showed around 14 hours outdoors per week might be the main cause of low myopia prevalence in Sydney schoolchildren (20). The preliminary domestic data also showed outdoor activities might be an important protecting factor for myopia among rural school children in Taiwan (21). In the vision care advisory council of the MOE in 2009, the author (PC Wu) proposed the new concept in the council that outdoor activities should be added as an important item in TSVCP and suggested at least 2 hours outdoors for myopia prevention. It was demonstrated by the domestic and foreign studies mentioned above. The director general of the Sports Division of the MOE (Chun-Chuan Wang) then accepted the concept and implemented the 120 minutes of outdoor activity everyday “Tien Tien 120” for myopia prevention into TSVCP from 2010. There was a transition period that shifted from distance gazing to outdoor activities. Therefore, outdoor distance gazing for 120 minutes everyday was promoted in 2010 initially, and then replaced by 120 minutes of outdoor activities every day, regardless of the type of activity. Thirty minutes of near work followed by a 10 minute-break [3010], improved room lighting, and adjusting table heights continued to be promoted in schools. In 2013, Wu reported that outdoor activity during class recess has the effect of myopia prevention in schoolchildren (22). This study showed the recess outside classroom (ROC) program could decrease half of the new onsets of myopia and myopic shift, especially in non-myopic children. After that, classroom clearance during recess was promoted in schools. From 2014, spreading the important concept of “myopia disease” was additionally implemented into TSVCP and health education.

Figure 1 Vision impairment rate of primary schoolchildren (over one million children) in Taiwan. After outdoor activities implemented in the Taiwan Student Vision Care Program, the vision impairment rate decreases.

The vision impairment rate of primary school children in Taiwan dramatically decreased, unprecedentedly, and continued after the outdoor implementation from 2012 to 2015 to around 46% (Figure 1). This may represent that the outdoor activity implementation in TSVCP works in myopia prevention among schoolchildren in Taiwan. Outdoor recess is simple, free, and an effective intervention for children and is widely reported in the media. Although outdoor activity is promising for myopia prevention, the challenge of being glued to a screen (smartphone addiction) is coming. In any case, there is still a long way to fight against myopia. The silence of myopia is possible and can be anticipated.

Nowadays, the TSVCP is reiterating to teachers and students that myopia is an irreversible disease and progresses in children. In addition, outdoor activities and near work breaks are the main items for myopia prevention promoted in school. Meeting and looking for consensus between the educational, health, and medical care systems are held regularly for myopia prevention. For myopic children, the referral system to ophthalmologists is continuing to be monitored. Evidence-based effective treatments such as low concentration atropine or orthokeratology are the treatments of choice for the control of myopia.

In conclusion, complications of myopia have become an important public health issue with serious socio-economic burdens. Prevention and treatment are both important. Evidence-based protective and risk factors have become clearer. Proper conceptualization of myopic disease, preventing the onset of myopia, prompt diagnosis, and early treatment to control progression are all important. The aim of the TSVCP is to decrease the prevalence of myopia, in order to decrease the high myopia related blind population in the near future.


Acknowledgements

The authors thank all the contributors in the Taiwan Student Vision Care Program.


Footnote

Conflicts of Interest: The authors have no conflicts of interest to declare.


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doi: 10.21037/aes.2018.01.05
Cite this article as: Wu PC, Chang LC, Niu YZ, Chen ML, Liao LL, Chen CT. Myopia prevention in Taiwan. Ann Eye Sci 2018;3:12.