Sunglasses are really popular nowadays, especially for this hot summer, and they are effective to block the harmful UV rays coming from the sunlight, so, they are becoming a necessary accessory for people to go outside from indoors, just as their cats or purses! And as the development of today’s advanced optical tech, individuals who have the eye disease including myopia and hyperopia can also have alternative choice of wearing prescription sunglasses, at this situation, you don’t need to carry a special clip-on in your pocket, and switch it when you are from indoors to outdoors or turn back! However, when people come from outside, their vision will be darken as the sunglasses lenses eliminated much visible light, and it may be considered to be a wired behavior to wear sunglasses for working, even they are just prescription sunglasses. So, is there a kind of prescription eyeglasses that can turn to sunglasses automatically when people go outside, while still the same when they are inside? (more…)