There are many commonly held beliefs about eye glasses and eyesight that are not proven facts.
				出自-2011年6月听力原文
				We have all heard some of the common myths about how eyesight gets bad
				出自-2011年6月听力原文
				However, although eyestrain may cause some pain or headaches, it does not permanently damage eyesight.
				出自-2011年6月听力原文