Blurred eyes in an air-conditioned house may be caused by the dry indoor environment, which causes excessive evaporation of tears, leading to dryness of the ocular surface, thus resulting in blurred vision of the patient. Usually, air conditioners not only have the function of regulating the temperature, but also act as dehumidification, which will evaporate the moisture in the indoor air, thus performing the function of cooling or warming. The air in the air-conditioned house is not smooth, can not do good ventilation, and the dry indoor environment, will accelerate the evaporation of human tears, so that the eyes become dry, which leads to patients with blurred vision performance. Daily we should develop the habit of blinking more, pay attention to the rest of the eyes, avoid staying in the air-conditioned house for a long time, air-conditioning time should not be too long, and often open the window to ventilate the air to ensure that the indoor air circulation. Blurred eyes may also be due to other eye diseases, long time symptoms without significant improvement, it is recommended that patients seek medical attention in a timely manner, under the guidance of the doctor for treatment.