各种家庭活动都需要光亮，照明是为人们创造必要工作和生活条件的一项重要措施。有的家庭为了节约电费。经常用光线很弱的灯照明，在暗淡的灯光下看书、写字或做其它工作。这样，久而久之会损坏眼睛。当然，房间里也不是越亮越好。光线过强会对人眼产生刺激性，由明亮的环境转 All kinds of family activities need light. Lighting is an important measure to create necessary working and living conditions for people. Some families save electricity. Lights are often lighted with light, reading, writing, or other work under dim light. In this way, eyes may be damaged over time. Of course, the brighter the room is, the better. Too much light will cause irritation to the human eye, from a bright environment