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Medical Forum / General / Vision / December 2007How to ask optician to round off edges of lenses?
I expect to order a new pair of glasses shortly. I need strong concave lenses. Twenty years ago, when I didn't need quite such a strong prescription but high refractive index glass didn't exist, I had 'coke bottle' style glasses, with parts of the lenses near my nose ground flat. I didn't see through that bit, so it had no practical effect on the view, but if it hadn't been done the sharp edges there would have stopped me from wearing them, or at least made them uncomfortable and dangerous. Last year I paid far too much for a pair of glasses with lenses that are 9mm thick near the nose, making them uncomfortable to wear, even after I had taken them back for them to try again to get the lenses mounted in the frame (they admit they botched this the first time). There has been very little material shaved off, just enough to avoid having a razor sharp edge. I suspect that shaving off material here is no longer required often enough for them to do it routinely. Is there a phrase I should use to ask for it, or do I just point at last year's pair and say "please don't do this again"?  SignatureA.G.McDowell >I expect to order a new pair of glasses shortly. I need strong concave >lenses. Twenty years ago, when I didn't need quite such a strong [quoted text clipped - 14 lines] >should use to ask for it, or do I just point at last year's pair and say >"please don't do this again"? "Roll the edges". If you want those edges polished to then the phrase is "Roll and polish the edges". And if the edges aren't rolled enough then the phrase is "make the roll heavier" or just "roll them more". >I expect to order a new pair of glasses shortly. I need strong concave > lenses. Twenty years ago, when I didn't need quite such a strong [quoted text clipped - 14 lines] > should use to ask for it, or do I just point at last year's pair and say > "please don't do this again"? You need to be careful about beveled or polished edges, because they can sometimes allow light to enter the edge of the lens and cause glare. It would help to know your Rx, but assuming it is fairly strong, then you probably want a 1.67 index or higher lens with a aspheric design to keep the lens reasonably thin at the edges. (trimmed) >You need to be careful about beveled or polished edges, because they can >sometimes allow light to enter the edge of the lens and cause glare. > >It would help to know your Rx, but assuming it is fairly strong, then you >probably want a 1.67 index or higher lens with a aspheric design to keep the >lens reasonably thin at the edges. Thanks for that. My current prescription is about -18 dioptres with +2 dioptres of cylinder on both eyes. The problem pair of glasses have high refractive index plastic lenses. The year before last I had glass lenses which I am currently wearing instead, and don't have this problem - they're about 6.5mm thick near the nose. I ask for plastic lenses if possible, because I ride a bicycle and worry about broken glass near my eyes if I come off. Last year the optician said they could do them in plastic. The year before last a different optician had said I had to have glass. Maybe I should go for glass again. Certainly there is nothing to be gained by cycling with glass lenses in an out of date prescription. SignatureA.G.McDowell > Thanks for that. My current prescription is about -18 dioptres with +2 > dioptres of cylinder on both eyes. The problem pair of glasses have high [quoted text clipped - 7 lines] > nothing to be gained by cycling with glass lenses in an out of date > prescription. You are probably going to want (or need) at least a 1.74 index lens. These can be very thin at middle, so I would avoid glass if possible. >(trimmed) >> [quoted text clipped - 16 lines] >nothing to be gained by cycling with glass lenses in an out of date >prescription. If you're in the U.K., or outside of the U.S., Zeiss's 1.9 index of refraction glass lenses should be on the table. However, they're not tempered, and have a center thickness in the .9mm to 1.2mm range, but would be the thinnest lens that you can get. You could wear safety goggles over the glasses for extra safety. Hope this helps, Robert Martellaro ~~~~~~~~~~~~~~~~~~ Optician/Owner Roberts Optical Wauwatosa Wi. ~~~~~~~~~~~~~~~~~~ "Science is a way of trying not to fool yourself." - Richard Feynman >I expect to order a new pair of glasses shortly. I need strong concave >lenses. Twenty years ago, when I didn't need quite such a strong [quoted text clipped - 14 lines] >should use to ask for it, or do I just point at last year's pair and say >"please don't do this again"? Ask for a heavy safety bevel and a straight back hide-a-bevel (minimizes the coke bottle look). I would not roll or lay-back the bevel for cosmetic reasons, although a slight roll or lay-back may be necessary to allow the lens to clear the pad arms, and to allow the temples to close. Your optician, whenever possible, should choose a frame that does not require a rolled edge to achieve this. The lenses must have an anti-reflection coating. Hope this helps, Robert Martellaro ~~~~~~~~~~~~~~~~~~ Optician/Owner Roberts Optical Wauwatosa Wi. ~~~~~~~~~~~~~~~~~~ "Science is a way of trying not to fool yourself." - Richard Feynman A.G.McDowell schreef: > I expect to order a new pair of glasses shortly. I need strong concave > lenses. Twenty years ago, when I didn't need quite such a strong [quoted text clipped - 14 lines] > should use to ask for it, or do I just point at last year's pair and say > "please don't do this again"? Consider an Adidas frame, several frame's have the possibility of a tiny insert frame which you "click" at the backside. Use high index plastic glasses (1.74) The above is mentioned for using in sport. Maybe this helps, Jan (normally Dutch spoken) |
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