科学素养与生活应用·英语30篇（1）

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偏光太阳镜为何能消除眩光，却无法过滤全部蓝光

Polarized sunglasses block horizontally vibrating light waves that cause glare off surfaces.
Sunlight reflects off water, snow, or roads and becomes mostly horizontal in orientation.
The lens contains a special chemical film aligned vertically to absorb those waves.
This selective filtering makes driving and boating much safer and more comfortable.
However, blue light from digital screens passes through because it vibrates in all directions.
Not all dark lenses are polarized—some only reduce overall brightness without cutting glare.
Polarization does not equate to UV protection, though most quality pairs include both.
You can test polarization by rotating one lens over another and watching for dimming.
These glasses help prevent eye strain but won’t replace blue-light filters for screen use.
Optometrists recommend them for outdoor activities where reflective glare is common.