A polarized filter is a coating, usually heat-sealed to the lens, that is not visible at first glance and its purpose is to polarize light, thus cleaning our image from the reflections of the sun. It was discovered by the just eighteen-year-old Edwin Land in 1927. Since then, most sunglass manufacturers have often used this new technology, as the comfortable, non-reflective vision offered by these filters has been much loved by the world. However, there are some glitches with polarizing filters. 

People suffering from astigmatism of more than 1 degree are often observed to feel a sense of dizziness with the polarized lenses. Polarizing filters also interact with liquid crystal displays (LCDs) and this is because LCDs also have a polarizing filter. This practically makes it difficult for people who use glasses with polarized lenses to see screens such as their cell phone screen, gps, smartwatches, etc. So the conclusion we can draw about polarized lenses is that they are very useful for places with strong reflections such as beaches, snowy mountains, driving against the sun and many other situations, however if someone has astigmatism, is in a place with low sunlight or when driving one needs to look at gps or other screens polarized lenses may not serve them.