Year : 1983 | Volume
: 31 | Issue : 7 | Page : 813--815
Prevention of school myopia
President of International Society of Myopia Research , Yolohama, Japan
President of International Society of Myopia Research , Yolohama
|How to cite this article:|
Sato T. Prevention of school myopia.Indian J Ophthalmol 1983;31:813-815
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Sato T. Prevention of school myopia. Indian J Ophthalmol [serial online] 1983 [cited 2021 Jun 14 ];31:813-815
Available from: https://www.ijo.in/text.asp?1983/31/7/813/29674
The prevention of school myopia would become sure if the mechanism of school myopia clear. I researched into this problem since 1939 and got the result as follows:
As there is no sufficient time I am going to show mostly in articles. The detailes are written in original reports.
School myopia=weak myopia strong myopia
Sato's theory=Jager's theory Heredity: axial length Environment: lenticular
emmetropization by accommodation
More accommodation- school myopia (near work)
Existence and importance of school myopia
Tokyo University: farm=60%: 12% Restriction of near work-> % decrease to 2/3 1/2
Easy to cause school myopia in monkeys by accommodation (Sato, Young).
Easy to cause school myopia in Caucasian by learning of Chinese characters. Epidemy of school myopia in Eskimos.
Parents: children=O 2%:65 88%
Development of Sato's theory
Distribution curve of phoria [Figure 1][Figure 2] before and after monocular prolonged
Refractive curve [Figure 3][Figure 4][Figure 5] atropinzed->cliniary tonus'spasm apahakic-'organic adaptive change
The bases for adaptive organic changes
Physical rule: histresis of elasticity of the crystalline lens
Physiological rule: Functional hypertrophy or disuse atrophy of the ciliary muscle
Hypertrophy in direct proportion to accommodation (histologically) Refractive power of lens in direct proportion to accommodation (biologically) Refractive index, surface curves of lens change remarkably in growth but the total refractive power does not change.
Progress of development
Conscious adaptive organic
continuous - Tonus - change of
accommodation lens and muscle
Prevention of school myopia
Keep working distance more than 30 cm. Keep near work not continually. Improvement of complicated Chinese characters.
Above must be done for a long period between 3 20 years old.
of school myopia in Japan decreased to 2/ 3 1/2 by above.
Cure of school myopia
Combination with preventing procedures. Training to look distance and near alternately.
Use weak mydriatica before goind to bed. Above must be done until 20 years old.
|1||Sato, T.: Ein Beitrag zur Kenntnis der Rfraktionskurve, Acta Soc. Ophthalm. Jpn. 45: 2277-2291, 1941.|
|2||Sato, T.: Acquired myopia. Proc. Ist internat. Conf. on Myopia, New York, 1964.|
|3||Sato, T.: The causes and prevention of acquired myopia, pp. 1-244, Yokohama, Japan, 1957.|
|4||Sato, T.: Summary and criticism of Sato's theory on school myopia. Proc. 2nd Internat. Conf. on Myopia, Yokohama, Japan, 1980.|
|5||Sato, T.: Errors in the deduction that supports the axial theory explaining school myopia. Verification by means of mathematics, Acta Soc. Ophthalm. Jpn. 86: 2153-2157,1982.|