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在我国普及电视教学的同时,必须重视电视教室的设计和使用。目前,由于事先对电视教学的视看条件缺乏研究,电视大学学员的视功能已受到不同程度的不良影响,近视眼发生较多。据调查,某些班中学生在学期末视力比学期初下降多达44.4%,近视发生率比学期初增加12.9%,而课桌面照度水平、视距(以人眼至电视屏幕的水平距离
In the popularization of TV teaching in our country, we must pay attention to the design and use of TV classrooms. At present, due to the lack of prior viewing conditions for television teaching, the visual function of TV university students has been adversely affected to varying degrees, and myopia occurs more. According to the survey, the visual acuity decreased by 44.4% at the end of the semester in some classes and the rate of myopia increased by 12.9% from the beginning of the semester. However, the level of illumination at the desk, the apparent distance (the horizontal distance from the human eye to the television screen