In the first place, before the invention of polarized sunglasses, many have the nag that their eyes are constantly hurt when contacting with the blinding sunshine. The disgusting sun lights penetrate into their eyes thus increasing the incidence of potential hazards and making their eyes uneasy. Moreover, they cannot be prevented even after wearing a pair of sunglasses because the all-pervasive sun light will find the way to come to the eyes.
Therefore, the designer together with the optimist racks their brains to avoid sun light penetration. In order not to be affected by the light reflected form the surface, polarized sunglasses just make use of this attribute which is called polarization by the phoyophysicists. They invite the horizontal axis to let the sun ray polarize, so the lenses in the vertical polarizing style can efficiently reduce the luminance of the sun light.
Last but not the least; polarized sunglasses, though a small progress is made, can help you to get rid of the dangers. For instance, when you are boating on the lake, and you eyes suddenly receive the sharp light and you may steer you boat in a wrong direction.
In conclusion, polarized sunglasses are really a big invention after their birth. It is suggested that people addicted to outdoor activities prepare one pair of such sunglasses to give yourselves more opportunities to survive in the open air.
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