When air conditioner operates, it will cool the room temperature and the steam in the room will turn into liquid and be drained. That's why people feel dry in room with air conditioner. There are several methods to solve the problem. If you already have dry eye, the most effective way is using eyedropper. That will help immediately. To be easier, you can just blink more often so that your eyes will be protected from drying. Drinking more water and reduce the time of facing TV or computer screen are also helpful. If you want to avoid the situation thoroughly, put a cup of water, a humidifier or some plants in the room when you start the air conditioner. It will keep the air in the room moist.