How do transition lenses work?

mediamike

They are light sensitive,they become darker when exposed to ultraviolet light and lighten when removed from the light. Mar 13 06, 5:32 PM

Baloo55th

They contain molecules like silver chloride or silver halide which change shape in ultraviolet light. Bit like a photographic film, but reversible. Early ones were somewhat patchy depending on the lens thickness, but the current ones are even in change. Except when you've been lying down with something shading part of the lens... http://science.howstuffworks.com/question412.htm Recommended by Baloo, who wears them. Only problem can be in car - the windscreen blocks UV so they don't change quite as much as they would outside. I don't find it a problem. Mar 13 06, 5:49 PM

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