Everyone knows that optometry is required before wearing glasses. However, you may not know that the results of optometry vary at different times of the day. Why? Wenzhou Wanrun Glasses Company will take you to know that the optometry effect is usually good during the day and in the morning. Why is optometry good in the morning? This is because when the eye looks at different objects far and near, it mainly depends on the contraction and relaxation of the ciliary muscle and the thickness of the lens to adjust the focus. After a night's rest, the ciliary muscles can be completely relaxed. At this time, the optometry result is accurate.