Sunglasses actually have a shelf life.
Sunglasses actually have a shelf life. "Using beyond the age limit" can harm your eyesight and health.
Sungalsses, also known as sunshades, are used to block the sun's ultraviolet rays, infrared rays, and harmful glare. They can adjust and serve human vision, but we seem to rarely realize that sunglasses also have a shelf life.
01/Reasons for shelf life
The lens material of sunglasses will age over time. "Overage use" will not only fail to protect the eyes, but will hurt the eyes
Most of the glasses sold on the market have a coating on the surface. The coating reflects ultraviolet rays to protect the eyes, but the coating is prone to oxidation and shedding over time
Generally speaking, a new pair of sunglasses has a service life of about two years. If the reflective effect of the sunglasses surface becomes worse, it means that your Polarized Sunglasses need to be replaced
02 /The harm of overage use of Sunglasses
02 /The harm of overage use of Sunglasses
Worn lenses are very likely to have dispersion and other phenomena. Wearing such sunglasses will make people's eyes feel tired and hurt their eyes
Such sunglasses not only cannot block the entry of ultraviolet rays, but also because the transmittance of colored lenses is seriously reduced, after wearing them, the eyes will be like looking at objects in a dark room, which will make the pupils larger. At the same time, unblocked ultraviolet rays will enter the eyes and damage the eyes
Long-term wearing can cause solar keratitis, corneal endothelial damage, fundus macular degeneration and other diseases