Why need UV400 sunglasses

Why need UV400 sunglasses?

We know that when there is strong light stimulation, our human eyes will automatically shrink to reduce stimulation.

In fact, this process is when the eyes automatically shrink their pupils, thereby preventing most of the strong light from entering the pupils and reducing the absorption of ultraviolet rays.

But if we wear sunglasses without UV protection, as the light becomes less intense, our pupils will not automatically contract,

This actually allows a large amount of ultraviolet rays to enter the eyes without protection, thereby damaging the macula, pupils, and lens, causing harm to the eyes.

So, we need to wear sunglasses with UV400 functionality.

High quality sunglasses usually have UV400 or UV380 functionality, so we can choose them with confidence.

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Why need UV400 sunglasses

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