Some styles don’t fully darken in vehicles. There will be a few minutes during which your lenses will be tinted indoors as they return to normal. While this may be true, the response is still not immediate. Transitions Signature GEN 8 lenses promise to clear up indoors faster than ever. Cold weather causes the molecules to move more slowly, so it may take longer for your lenses to darken. While Transitions lenses darken when exposed to UV rays, temperature influences how quickly the photochromic molecules react in your lenses. As long as you remember your glasses, you’ll have remembered your sunglasses too.Ĭold weather can affect the transition. Having one pair of glasses that will adapt to your lifestyle and environment makes it less likely that you’ll lose them. Many sites sell off-brand photochromic lenses that may not be as effective as Transitions.Įasier to keep track of. There are also online vendors that sell transition lenses, but make sure the lenses you’ve selected are Transitions brand lenses before you buy. If you decide to go through your eye doctor’s office or an optical shop to get your glasses, they’ll likely offer to add Transitions to whatever frames you choose. With photochromic eyewear, you’re getting an all-in-one deal that your vision insurance will partially or fully cover. While Transitions aren’t cheap, the investment is less expensive than having to buy a separate pair of prescription sunglasses to supplement your regular eyeglasses. With Transitions, there’s no hassle of juggling two sets of frames, only the seamless adaption of your lenses to your environment. Many glasses wearers know the struggle of having to switch over from regular glasses to sunglasses. So, whether you’re outdoors or in, your Transitions have you covered.Ĭonvenient. Transitions offer continuous protection from the sun’s UVA and UVB rays, as well as blue light from your digital screens. While Transitions prides itself as the leader in technology for transition lenses, here are some specific pros and cons to using them: Pros SEE RELATED: How quickly do photochromic lenses transition? Pros and cons of Transitions lensesīefore investing in a pair of Transitions lenses, it’s wise to weigh the benefits and drawbacks to owning a pair. When transitioning from outdoors to indoors, the molecules will revert to their original state, causing the lenses to lighten and become clear again. Shaded areas or overcast weather will still cause the transition lenses to adjust to the exposure, but will not darken as dramatically as when you’re in full sun. Using an exclusive, patented formula, the molecules can sense the level of UV exposure and adjust accordingly.įor example, if you’re in direct sunlight, the Transitions lenses will be at their darkest. The molecules’ reaction to UV exposure causes the lenses to darken. Transitions infuses their lenses with trillions of photochromic molecules that change structure when exposed to UV rays. Since then, the Transitions brand has produced six subsequent generations of lenses and expanded to a worldwide market. The first generation of Transitions lenses needed some improvements, so the company released the second-generation lenses in late 1992 and saw enormous success. In the end, Transitions did not use the CR-39 monomer for the lenses, as they found the material wasn’t suitable for the production process. The first-generation plastic photochromic lenses were produced in 1991. PPG continued researching, testing and perfecting their product until 1989, when the company marketed the lenses under the Transitions trademark in partnership with Essilor International. While another manufacturer called American Optical Corporation beat PPG to the production of plastic photochromic lenses, sales of the lenses did poorly. Inspired, PPG started testing the photochromic technology on CR-39 monomer lenses. In the mid-1950s, chemists discovered that CR-39 monomer could be used in the production of eyeglass lenses, and it became the world’s most widely used ophthalmic plastic.Ī different company, Corning Incorporated, first developed photochromic glass lenses in the 1960s and marketed them under the brand name PhotoGray. When WWII ended, PPG had large quantities of CR-39 monomer left over, so they had chemists explore other uses for the material. Engineers used the material to line fuel tanks of military bombers in World War II to protect the tanks from bullet impact. In 1940, a research team at Pittsburgh Plate Glass Company (PPG) developed a material called CR-39 monomer. The adaptive technology of Transitions lenses can accommodate virtually every frame, style, size and prescription. Transitions lenses are brand-name eyeglass lenses that darken with UV exposure and thus provide vision correction and sun protection in one pair of glasses.
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