Wenzhou Wanrun Glasses Co., Ltd. tells you that when the eyes focus on objects at different distances, they mainly rely on the contraction and relaxation of the ciliary muscle, and adjust the focus by pulling the lens thickness. After a night's rest, the ciliary muscles were completely relaxed in the morning, and the measured data were closer to the true diopter. 

  If you choose to use it in the afternoon or evening, the ciliary muscle after using the eyes is usually in a state of fatigue. If you choose to wear glasses at this time, the optometry result may be very high. Wearing such glasses may not cause any discomfort, but dizziness, dry eyes and other symptoms may occur two or three days after wearing glasses.