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C. Matsuo, T. Matsuo; Reproducibility of Prevalence Rates of Strabismus and Amblyopia in Japanese Elementary School Children Between the Year 2003 and 2005 Survey. Invest. Ophthalmol. Vis. Sci. 2007;48(13):4856.
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© ARVO (1962-2015); The Authors (2016-present)
We previously revealed the prevalence of strabismus and amblyopia in a large population of elementary school children from grade 1 to grade 6 with the ages ranging from 6 to 12 years in Japan in the year 2003 (Ophthalmic Epidemiology 2005;12:31-36). The purpose of this study is to repeat the survey in the year 2005 and to test the reproducibility of the prevalence rates.
Eye examinations, including visual acuity testing and inspection of ocular surface and eye alignment, are conducted usually by ophthalmologists in elementary schools once a year according to the School Health Law in Japan. Children, suspected of eye diseases including strabismus and amblyopia, are then sent to ophthalmologists for detailed examinations and they bring back the results to schools. Schools report the summary to the education committee in each city or town, and the results of eye diseases are made public on home pages of the Prefectural Government and the Education Ministry of the Central Government. The prevalence of strabismus and amblyopia remains unknown from data on these home pages because these diseases are comprised in the entity of eye diseases. In this study, questionnaires asking the number of children with different types of strabismus and amblyopia were sent to all elementary schools in Okayama Prefecture in the year 2005, and the results in the year 2005 survey were compared with those obtained in the year 2003.
The number of children covered by the return of questionnaires was 84,619 (74.4%) of 113,763 total pupils including grade 1 to grade 6 in Okayama Prefecture in the year 2005. The total numbers of children with strabismus and amblyopia including grade 1 to 6 were 844 (1.0%) and 173 (0.20%), respectively. The numbers of children with any types of exotropia and any types of esotropia were 524 (0.62%) and 187 (0.22%), respectively. In the previous survey conducted in the year 2003, the number of children covered by the return of questionnaires was 86,531 (76.4%) of 113,254 total pupils. The total numbers of children with strabismus and amblyopia were 1,112 (1.28%) and 125 (0.14%), respectively. The numbers of children with any types of exotropia and any types of esotropia were 602 (0.69%) and 245 (0.28%), respectively.
The prevalence rates of strabismus and amblyopia in a large population of Japanese elementary school children were comparable between the year 2003 and 2005, indicating the reliability of the survey method.
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