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Medical Forum / General / Vision / March 2008Transition Lenses
I've checked out the Transitions site, which is not very informative, so I have a question. What are transition lenses made of, and how good are they optically? Certainly hope they are not polycarbonate. Thanks, riserman > I've checked out the Transitions site, which is not very informative, so I > have a question. What are transition lenses made of, and how good are they [quoted text clipped - 5 lines] > > riserman Transitions (photochromic) lenses can usually be obtained in several different lens materials, such as 1.50 plastic, polycarb, and maybe others depending on the lens manufacturer. So the "transitions" part of a lens is embedded in the lens when it is made, and can theoretically be used in any kind of lens material. Making a lens photochromic does not measurably affect the lens quality, however, even the best photochromic lenses are not completely clear when indoors, so there is some light lost in most situations. > I've checked out the Transitions site, which is not very informative, so > I have a question. What are transition lenses made of, and how good are > they optically? The ones I bought ~5 years ago were fine optically but worthless inside a car, which is where I generally am when I'm outside. Even when I wasn't in the car they weren't dark enough to be considered sunglasses. > Certainly hope they are not polycarbonate. CR39 as far as I knew.  SignatureCheers, Bev --------------------------------- aibohphobia - fear of palindromes >> I've checked out the Transitions site, which is not very informative, so >> I have a question. What are transition lenses made of, and how good are [quoted text clipped - 7 lines] > > CR39 as far as I knew. Good point about wearing them inside a car. Apparently the car glass filters a lot of the UV that causes the lens to get dark. A friend of mine used to wear clip-on sunglasses over his transitions just when he was driving <g>.
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