问HN：为什么电脑不告诉你你的眼镜需要清洁？
难道不能用网络摄像头来做到这一点吗？<p>当然，只有在镜片中央附近有污迹，确实会影响你在使用电脑时的视力时，才应该被告知要清洁眼镜。
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Can't the webcam be used to do this?<p>Of course, you should only be told to clean your glasses when there are smudges near the center of a lens that would actually impact your vision when using the computer.