Sunglasses are an effective and affordable way to protect eyes from UV damage.
UV damage occurs in the morning from 8.00 - 10.00 and in the afternoon from 2.00 - 4.00.
Not all sunglasses provide UV radiation. Such sunglasses are harmful to eyes because the darkened filter causes pupil dilation that allow more light to enter the eyes.
Sunglasses were in fashion in the 1930s. Nowadays people cannot imagine a day without sunglasses.
Do UV coating on your sunglasses have an expiration date?
The good news is - no they don't.
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