Sunglasses are best changed every two years

Sunglasses are best changed every two years

Many people use a pair of sunglasses for many years. In fact, sunglasses also have a shelf life, which is related to the wearing time, lens material, wearing habits, and regional sunshine. Generally speaking, the best period of use of sunglasses is roughly two years, and it is best to change to a new pair after that.

First of all, the main place for sunglasses to   wear and age is the joints of   the lens

nd nylon are temporarily classifi ed into this category), and   glass lenses. Lightweight and comfortable   resin   polarizers   and resin PC lenses are not wear-resistant, and will be scratched after a long time.

Many people don't know that the lens is worn out, and relying on eye adjustment to try to see clearly will increase   fatigue in the long run, resulting in vision loss. Therefore, usually the lens should be placed upwards to avoid scratches   on the mirror surface.

Secondly, if the lens is exposed to sunlight for a long time, it will reduce the ability to prevent ultraviolet rays and easily cause damage to the cornea. Even if the lens material of high-quality sunglasses uses special materials, it will

age over time.

If the anti-ultraviolet function of sunglasses decreases, it will damage the cornea and retina, and diseases such as solar

keratitis and corneal endothelial damage will occur.

In addition, the sunglasses belong to the series of flat lenses, which are only allowed to have a diopter of plus or   minus 8 degrees at most. If it exceeds this error range, it is a substandard product. Consumers with normal eyesight   wear this kind of sunglasses, just like wearing a pair of myopia or farsighted glasses. After one summer, they will be   "cultivated" by inferior glasses to become myopia or hyperopia patients. Therefore, if symptoms such as dizziness,   nausea, and dazzling appear after wearing sunglasses, they should be taken off immediately.

Buy sunglasses to go to a regular store. Some cheap sunglasses not only can't filter out ultraviolet rays, but will make   ultraviolet radiation more obvious after blocking visible light. Be careful not to wear sunglasses for a long time,   otherwise your eyes will get tired. Sunglasses should be removed when entering the room from the outdoors. Don't   choose sunglasses with large frames, it will increase the burden of eyeball adjustment and damage vision.

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