The main part of sunglasses that wears out is the joint between the lens and the frame. The lenses, in particular, will show scratches over time.
However, many people do not know that after the lens wears out, it depends on the eyes to adjust to see as clearly as possible. This will increase fatigue over time, which will lead to vision loss.
Secondly, the lenses are exposed to the sun for a long time, the ability to protect against ultraviolet rays will decrease, which can easily cause damage to the cornea.
It is advisable to change a new pair of sunglasses for two years to protect your eyes.
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