To a large extent, minus numbers are genetically predetermined and their extent of increase not in our control. However, in an interesting study done in Japan, children from similar genetic stock were divided into 2 groups. One group studied only in English for 10 years while the other studied only in the complicated Japanese script. At the end of the 10-year period, there were more students wearing minus numbered glasses in the Japanese script group. Thus there is an environmental component perhaps to an increase in numbers – though there is no universal agreement on this subject.
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