但还有其他方面的问题。头部和屏幕之间的距离以及两者之间的方位关系同样是重要的风险因素。要让眼睛舒适地聚焦,屏幕和面部之间的距离应保持在20至26英寸左右(约合51至66厘米)。眼睛离屏幕越近,就越难以做出调整去适应屏幕。
In addition, when looking straight ahead, the eyes should be at the level of the top of the monitor. The University of Pennsylvania’s ophthalmology department advises that the center of the monitor should be about four to eight inches lower than the eyes to minimize dryness and itching by lessening the exposed surface of the eyes because they are not opened wide. This distance also allows the neck to remain in a more relaxed position.
此外,当望向正前方的时候,眼睛应与显示器顶端平齐。宾夕法尼亚大学(The University of Pennsylvania)眼科学系建议,显示器中心应比眼睛低4至8英寸左右(约合10至20厘米),以尽量减少眼睛干涩和瘙痒的症状,因为这样的话就不用把眼睛睁得太大,眼球暴露在空气中的面积就会减少。
Yet, in a study in Iran of 642 pre-university students reported in Biotechnology and Health Sciences last year, 71 percent sat too close to the monitor for comfort, and two-thirds were improperly positioned directly opposite or below the monitor.
不过,伊朗的一项以642名高中生为对象的研究显示,71%的人坐得离显示器过近,好让自己更舒适一些;三分之二的人以不恰当的方式正对着显示器,或者坐得比显示器低。这项研究的结果于去年发表在了《生物技术与健康科学》(Biotechnology and Health Sciences)上。
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