The function of sunshade caps

As the weather gets hotter in summer, a sunshade hat that can cover the entire face has quietly become popular on the streets of many cities. Ophthalmologists have warned that many of these so-called "sun protection and eye protection" sunshade hats are low-quality products that not only fail to work, but may also affect people's vision.
Walking through the streets and alleys, you will find that the majority of citizens wearing this type of sun hat are cyclists and younger children. In the small commodity market, there are many popular sunshade hats that are selling for 7-10 yuan. They are made of materials similar to colored plastic and can rotate up and down flexibly. They can be worn like regular sunshade hats or used as sunglasses. The merchant introduced to the customer that this UV resistant hat is popular in summer and has a protective effect. It is not easy to expose the skin and irritate the eyes.