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Medical Forum / General / Vision / March 2007What should I get?
Hi, Sorry if this sounds familiar. I have 3 prescriptions from three different opticians within the last 12 months here they are: First Test: Jan 06 Right Eye: Sphere: -1.00 , Cyl: +1.50 , Axis: 85 Intermediate: +0.75 Near +1.50 Left Eye : Sphere: -0.50 , Cyl: +1.25 , Axis: 95 Intermediate: +0.75 Near +1.50 Second Test: April 06 Right Eye: Sphere: -1.25 , Cyl: +1.50 , Axis: 70 Intermediate: +0.75 Near +1.50 Left Eye : Sphere: -0.75 , Cyl: +1.00 , Axis: 85 Intermediate: +0.75 Near +1.50 Last Test: Feb 07 Right Eye: Sphere: +1.00 , Cyl: +1.50 , Axis: 175 Intermediate: +0.75 Near +1.50 Left Eye : Sphere: +0.75 , Cyl: -1.25 , Axis: 2.5 Intermediate: +0.75 Near +1.50 I am 46 years old and I use the VDU over 10 hours a day. Currently, I am still using my 4 year old pair of glasses (don't ask why) which are a single vision zeiss lenses that I had these prior to getting a varifocal prescription. Are the differences between these 3 Rxs a lot or is it normal over such a period? I have never used a varifocal glasses before and slightly concerned that I may not be able to adjust easily especially when using the VDU. So, I am seriously thinking of getting a single vision glasses for VDU use only and then possibly a multifocal / varifocal pair to be used as a backup and for reading & distance. If I am going to order a single vision glasses solely for VDU use from a mail order company then do I just quote say the latest Rx with an Intermediate Add value? Many thanks for your time and I welcome your general advice or other viable alternatives? Regards Al Dear Al, If I am going to order a single vision glasses solely for VDU use from a mail order company then do I just quote say the latest Rx with an Intermediate Add value? Many thanks for your time and I welcome your general advice or other viable alternatives? Otis> This is a public forum, so when you say "general advice" -- that is what you are going to get. Otis> I am an engineer. Otis> Your "prescriptions are close to "plano". Otis> You might get a Snellen and see what your visual acuity actually is. Otis> While you show an "astigmatism" cut, you may find you can use a "spherical lens" for most application. Otis> Rather than messing around with varifocal glasses (they give some people a headache), you might try a comfortable +1.5 diopter lens (for computer work) in the store. That might be a more comfortable solution for your presbyopia. You probably do not need glasses for distance, given the "plano" type of prescription you have posted. The critical issue is whether you pass the DMV with no glasses. Otis> Just one engineer's opinion. Regards Al On Feb 21, 10:28 am, ali.als...@gmail.com wrote: > Hi, > [quoted text clipped - 52 lines] > > Al Before reading anything by Otis Brown, please review the following website: http://www.quackwatch.org/ Good luck, Neil Dear Al, Your other question was about "comparing" the refractive power of these three prescriptions, and I would prsume, your naked eye visual acuity. (i.e., DMV test). To compare them it is a good idea to reduce them to "Spherical Equivalent". You do this by taking the "Sphere" and adding 1/2 the Cyl. As follows: Last Exam: Right Eye: Sphere: +1.00 , Cyl: +1.50 , Sphere Eqi = 1 + 0.75 = +1.75 diopters Left Eye : Sphere: +0.75 , Cyl: -1.25 , Sphere Equ = 0.75 - 0.62 = + 0.13 diopters. (Effectively plano) This suggests that you could probably pass the standard DMV test which required the reading of letters 3/4 inch high at 20 feet. A +1.5 diopter "add", (which you could get over-the-counter) or from Zennioptical.com would probably meet your requirements. Just one engineers opinion. Otis On Feb 21, 10:28 am, ali.als...@gmail.com wrote: > Hi, > [quoted text clipped - 52 lines] > > Al Dear Al, Please disregard Otis's postings. He is not in the medical profession and not in any position to give medical advice. Thanks! Allen > Dear Al, > [quoted text clipped - 4 lines] > > Allen Medical Advice = Calling another person's advice worthless and repeat that person's advice Read the post titled "contacts for extreme myopia and near work." On Feb 12, 9:30 am, "javerra" <tnava...@flipforwardinteractive.com> wrote: > I have fairly moderate myopia -10.5 & -12, I've been wearing > disposable soft contacts for the past few years and maybe swam [quoted text clipped - 7 lines] > > Tom On Feb 12, 11:24 am, myopiac...@yahoo.com wrote: > Dear Tom, > [quoted text clipped - 22 lines] > Myopia Cure Promoter > http://www.geocities.com/myopiacure On Feb 12, 11:46 am, "Mike Tyner" <mty...@mindspring.com> wrote: > ...... the treatment you're recommending is worthless. > > -MT On Feb 12, 11:59 am, "Dr. Leukoma" <d...@leukoma.com> wrote: > The reason this advice is worthless is because it is based upon the > fundamental misunderstanding that accommodative "stress" causes [quoted text clipped - 3 lines] > > DrG On Feb 12, 1:33 pm, "Dr. Leukoma" <d...@leukoma.com> wrote: > The primary catalyst for your myopia is genetic. But, I am also of > the opinion that closework can also be influential in how fast it [quoted text clipped - 3 lines] > > DrG Wearing bifocal contact lenses and wearing reading glasses over contact lenses (what I suggested) are pretty much the same thing!! On Feb 12, 1:47 pm, "javerra" <tnava...@flipforwardinteractive.com> wrote: > How about wearing reading glasses while working at the computer. good/ > bad idea? > > Tom On Feb 12, 2:19 pm, "Mike Tyner" <mty...@mindspring.com> wrote: > Won't hurt, won't help. > > Push your monitor out as far as you're comfortable. Reading very close might > contribute, a little. > > -MT Reading far and reading very close with reading glasses are the SAME thing!!! On Feb 12, 4:32 pm, "Dr. Leukoma" <d...@leukoma.com> wrote: > ...... you should be using reading glasses. > > DrG I thought you said reading glasses is wortless!! > Reading far and reading very close with reading glasses are the SAME > thing!!! If it were, "plus prevention" would work and we'd all be using it. Parssinen's 300 subjects would have gotten nearsighted at different rates. So would the kids in the COMET study. So would Shotwell's subjects from the Naval Academy. It doesn't work. When you show us a comparative study that demonstrates otherwise, I promise to take it seriously. -MT > If I am going to order a single vision glasses solely for VDU use from > a mail order company then do I just quote say the latest Rx with an > Intermediate Add value? Since you're going to make a multifocal anyway, do that first and see how well it works at the computer. You may decide you don't need the single-vision, and using the multifocal will give you a better idea of which value will work best at the computer. The three values show a typical progression for someone your age. The most recent will give considerably better vision at the computer than the oldest. The third prescription was copied in error. The sign on the "cylinder" should be minus, not plus. There are two conventions for writing prescriptions. The first two were written in "plus cylinder" and the third in "minus cylinder." Please ignore the idiot who suggested drugstore glasses. Your distance vision is primarily blurry because of astigmatism. If you use drugstore glasses without astigmatism correction, your near vision with drugstore glasses will be as blurry as your distance vision _without_ glasses. -MT, OD Hi all! Thank you very much for taking the time & trouble to reply. Best wishes! A |
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