Sunglasses are not only very fashionable and good-looking, but also very practical life items in modern society. Generally, people like to use it in the hot summer days, and it does protect us from the damage of strong light.
But in fact, it’s not just the glare that can cause harm. On the snow-covered winter ground, the glare caused by sunlight in the white snow can also harm human eyes, and Causes snow blindness, but it’s easy to ignore it now.
However, about 2000 years ago, Inuit people inside and outside the Arctic Circle made ivory with ivory to prevent snow blindness. However, they seem to be more like a blindfold, and only a small gap appears in the middle area to let them observe everything.