不过,与电脑有关的最常见症状是眼部不适,包括视线模糊、重影,以及灼烧感、瘙痒、发干、发红等,所有这些都有可能影响工作表现。
One reason the problem is so pervasive: Unlike words printed on a page that have sharply defined edges, electronic characters, which are made up of pixels, have blurred edges, making it more difficult for eyes to maintain focus. Unconsciously, the eyes repeatedly attempt to rest by shifting their focus to an area behind the screen, and this constant switch between screen and relaxation point creates eyestrain and fatigue.
这一问题之所以如此普遍是因为:不同于印在纸张上边界清晰的文字,由像素组成的电子字符边界模糊,让人眼难以维持焦点。不知不觉中,眼睛会反复试图把焦点切换到屏幕后方的某个区域,以获得放松,而在屏幕和放松点之间的不停切换,会导致眼部疲劳。
Another unconscious effect is a greatly reduced frequency of blinking, which can result in dry, irritated eyes. Instead of a normal blink rate of 17 or more blinks a minute, while working on a computer the blink rate is often reduced to only about 12 to 15 blinks.
另一个不易被察觉的影响是眨眼频率大大降低,从而可能导致眼睛干涩、过敏。正常的眨眼频率是每分钟17次,但在电脑前工作时,常常会下降到12至15次。
But there are additional problems. The head’s distance from the screen and position in relation to it are also important risk factors. To give the eyes a comfortable focusing distance, the screen should be about 20 to 26 inches away from the face. The closer the eyes are to the monitor, the harder they have to work to accommodate to it.
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