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Medical Forum / General / Vision / May 2009Computer glasses as safety glasses?
When woodworking everything is about 2 or 3 feet away from me, which is kind of a bad distance with progressive lenses; but nothing is further away than 10'. I asked my eye doctor to give me a prescription where the base was stronger and the add was stronger, figuring that would help me at the distance I need them for. He said I should get computer glasses. I told him I couldn't stand polycarb and trivex wasn't available in a computer glass. He told me that plain plastic was plenty strong; I should just ask the optician to make them thicker than normal. Does that make sense? I have read that 1.67 has better impact resistance than CR-39. Would that be enough better a choice to justify the way higher price? BTW, when I was here a year ago it didn't have all this spam. Is there someplace better to go for help like this? :) > When woodworking everything is about 2 or 3 feet away from me, which is > kind of a bad distance with progressive lenses; but nothing is further [quoted text clipped - 13 lines] > BTW, when I was here a year ago it didn't have all this spam. Is there > someplace better to go for help like this? :) You probably should post your Rx. 1.67 may have better impact resistance than CR-39 for the same thickness of lens, but it will be a lot thinner for a given Rx. You don't have to purchase a lens designated as a Computer Lens by the lens manufacturer. In theory and progressive with the correct Rx can be used as a computer lens. Certain progressive lens designs are more amenable to this than others. Robert Martellaro of Roberts Optical is a very knowledgeable optician who posts here and could probably help you with finding a good one (and maybe even one that comes in Trivex).. >> When woodworking everything is about 2 or 3 feet away from me, which is >> kind of a bad distance with progressive lenses; but nothing is further [quoted text clipped - 24 lines] > very knowledgeable optician who posts here and could probably help you > with finding a good one (and maybe even one that comes in Trivex).. Prescription is +2 sph, +2.25 add. Thanks > Prescription is +2 sph, +2.25 add. > Thanks Since you are farsighted, your lenses will be thicker in the middle than the sides, and you don't need to worry quite so much about impact resistance. A nearsighted person with a high index lens would have a lens that is very thin at the center. >When woodworking everything is about 2 or 3 feet away from me, which is kind >of a bad distance with progressive lenses; but nothing is further away than [quoted text clipped - 13 lines] >BTW, when I was here a year ago it didn't have all this spam. Is there >someplace better to go for help like this? :) >Prescription is +2 sph, +2.25 add. >Thanks Shamir makes an "office" lens in Trivex. Ask for the Autograph 2 Office. There is a partial distance window at the top of the lens accessed by dropping the chin. Other options would be a progressive with the distance and near powers modified for your work distance. The above Rx would be changed to +3.00 distance (now intermediate) with a +1.25 Add, or +3.25 Add +1.00, depending on the work distance. The fitting cross will probably need to be lower than typical progressives, dependent on the angle of gaze towards the intermediate object. There's no distance window so have someone show you how blurred it will be at ten feet (using a trial frame or in the chair). You could do the same with lined bifocals, or your optician might consider a high set bifocal with the Add adjusted for the intermediate work distance. Near vision at 16" would probably be a problem with the latter, although that could be corrected by using a lens from X-Cel called Acclaim (Cr39 only), a trifocal that has a 61% intermediate, and is available in a variety of sizes, i.e. 10x35, 12x35 etc. Hope this helps, Robert Martellaro ~~~~~~~~~~~~~~~~~~ Optician/Owner Roberts Optical Wauwatosa Wi. ~~~~~~~~~~~~~~~~~~ "Science is a way of trying not to fool yourself." - Richard Feynman > Does that make sense? > I have read that 1.67 has better impact resistance than CR-39. Would that > be enough better a choice to justify the way higher price? The lens doesn't have to be thick to be impact resistant. Get the least expensive ones you can see with. I've used thin plastic safety glasses doing all kinds of wood working with zero problems with them. |
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