Sunglasses are dark glasses
Which absorb radiation and regulate the entry of sunlight
Passing through them to protect the eye and prevent glare.
Sunglasses are a popular fashion item in Western culture.
The sunglasses vary greatly in the amount of light they transmit at different wavelengths.
It is recommended that the Sunshades transfer between 10% and 30% of the visible light that harms them and will transfer very little, if any, ultraviolet light.
In general, the darker the lens, the less light it conveys.