Resin lenses have a certain life span, and it is usually recommended to replace them in about 2 years, excluding the influence of the eye prescription. With the prolongation of the use, the lenses are subject to a certain degree of wear and tear, which makes the eyes tired and may deepen the prescription, so it is not recommended not to replace them for too long. In general, the resin lenses will yellow with use, when the transmission rate of the lenses will have a corresponding degree of decline, which is harmful to the eyes and can easily cause visual fatigue. Especially when the yellowing of the two lenses is different, it is easier to increase the fatigue of both eyes. In addition, resin lenses are easier to scratch than glass lenses, thus reducing clarity and making it easier to see through unclear lenses for a long time, not only to produce visual fatigue, but also to produce other problems with the eyes. Although resin lenses are lighter, thinner, less fragile and have better light transmission than glass lenses, they are less resistant to wear and corrosion than glass lenses, so they need to be protected in daily life to prolong their life. When not worn, try to put them in the case, rinse them with water before wiping them, or clean the surface with detergent and wipe them with a fiber cloth to prevent scratches. Resin lenses are easily deformed by heat, so don’t wear them in baths or hot springs. In addition, if the eyes have been discomfort or loss of clarity, it is recommended to promptly optometry, if the degree of change, even if not to replace the age of the new should be promptly replaced.