They can take longer to darken in cold weather. However, some brands of lenses can darken in cars. Not all types darken well inside a car because the windshield usually has some protection against UV rays. Ask your eye doctor which brand may work best depending on your personal needs and preferences for darkening. The degree to which these sunglasses will darken often depends on the brand. They don’t always darken right away some glasses may take up to five minutes to darken. Consider some of the downsides of these sunglasses: Knowing the cons of photochromic sunglasses can help you decide if these lenses are for you. These sunglasses/glasses hybrid lenses can be made into nearsighted, farsighted, or bifocal prescription lenses. Photochromic sunglasses are made from materials such as polycarbonate and Trivex, which are lighter in weight and more resistant to scratches compared to other materials. You can Save money by ordering just one pair of glasses instead of two You are less likely to lose your glasses because you only have one pair They serve as a great option for children with correction needs since they don’t have to juggle multiple pairs of glasses You can select specific vision corrections when ordering them for your vision needs They protect your eyes from UV rays and limit your UV exposure, which increases your risk for cataracts Aside from eliminating the need to switch specs, photochromic sunglasses have many other advantages.
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