What is the use of sunglasses?

Among the many brands of sunglasses, many people are spoiled for choice, finally selected their favorite styles, you can choose many types of sunglasses but do not know where to start, often been fooled by shopping guide to buy a "looks beautiful", but not practical sunglasses. The main purpose of today is talking about sunglasses, so that everyone in the future to buy their own style.No matter what brand of sunglasses, can be divided into the following three categories according to their use.First, in fact, light-colored sunglasses sunshades are fashionable variants, although the barrier effect of the sun is less than sunshades, but its fundamental purpose is to play a decorative role, relying on rich colors and trendy styles popular with young people of all ages. In recent years, fashion women are fallen in love with these sunglasses.However, Sunshades well understood literally understand, it's used to block the sun's ray. People in bright light if you do not wear sunglasses, so you can only rely on their own eyes adjust the size of the pupil to adjust the luminous flux, but this is limited, once the light intensity adjustment capability than the human eye, it will inevitably cause damage to the eyes. Therefore, you should use the summer sunshades to protect their eyes and reduce eye fatigue and self-regulation in light stimulation caused the harm.In order for us not be deceived, so how to distinguish between true and false polarized sunglasses?1、Polarizing test card. The easiest way is to use polarized glasses test cards to measure whether there is polarizing effect, usually polarized glasses box will be accompanied with a polarizing test card, If there is no polarized test card can try the following methods.2、Screen test method. Combined with polarizing polarizer principle and the principle of the display, when looking at the display time by rotating the polarized glasses, The screen appears blank screen, it was caused by a single direction polarizer filter screen of light. And the display can be seen everywhere, which is the most feasible method polarizer.Through polarized sunglasses action described above, we should not unfamiliar to the polarized sunglasses, in the summer if you want to better protect our glasses should choose a good pair of polarized sunglasses. You can choose a pair of polarized sunglasses for their own according to the real situation of their eyes. You can also make your own statement.

Source : articlesbase.com