求翻译：目前我国学生近视发生率接近60%,居世界第一位。有调查显示青少年近视眼95%是缘于错误的握笔姿势，也有遗传因素之说，但课业负担过重导致的近距离用眼时间过长,仍然是学生近视的主要因素。比如运动和睡眠时间不足或者没有养成良好的用眼习惯。这些都会严重影响我们的视力。因此,我建议,每半年至少进行一次视力检查。是什么意思？

Current student myopia occurs close to 60% in China, ranking first in the world. Survey shows young people holding a pen gesture of myopia is 95% due to error, also said there are genetic factors, but caused by the excessively heavy homework takes too long to close eyes, remains the main factor of s

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