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Medical Forum / General / Vision / April 2007I need help converting my contact lens script.
I have slight astigmatism in both eyes but was told I can wear regular spherical lenses rather than toric if I prefer. My current lenses are toric and somewhat uncomfortable and I want to get regular spherical lenses, they are more comfortable (and cheaper). How do I change my astigmatic prescription to the power I would need in a regular lens or if someone could figure it out I would greatly appreciate it. Left sph -.50 cyl -.75 ax 170 Right sph -.75 cyl -.75 ax 170 >I have slight astigmatism in both eyes but was told I can wear regular >spherical lenses rather than toric if I prefer. My current lenses are toric [quoted text clipped - 5 lines] >Left sph -.50 cyl -.75 ax 170 >Right sph -.75 cyl -.75 ax 170 Your eye care provider will find a lens design/brand/material that fits properly, possibly one that's known to mask astigmatic error (if corneal) better than other materials, place a -1.00 on each eye, wait for lens to equilibrate, over-refract, wear trial lens for a week, evaluate, write Rx for CLs. Hope this helps, Robert Martellaro ~~~~~~~~~~~~~~~~~~ Optician/Owner Roberts Optical Wauwatosa Wi. ~~~~~~~~~~~~~~~~~~ "Science is a way of trying not to fool yourself." - Richard Feynman I did try Acuvue Oasys and O2 Optix before going with the toric and they worked and were comfortable. I don't have the packages fromthem however to view what power they were, I only have my toric packages. If I ask my eye care provider he of course will want me to get the contacts through him but I can order them online for half the price which is why I haven't asked him. My problem is trying to remember the power they were, I believe my right eye was a -1.00 and my left I don't remember. Is there not a way of figuring it out with the script I do have on hand? >>I have slight astigmatism in both eyes but was told I can wear regular >>spherical lenses rather than toric if I prefer. My current lenses are toric [quoted text clipped - 17 lines] >"Science is a way of trying not to fool yourself." >- Richard Feynman >If I ask my eye care provider he of course will want me to get the contacts through him You can have it filled anywhere if the CL Rx is current. Many doctors have competitive fees for replacement lenses, along with discounts on glasses if you purchase both from the same provider. >Is there not a way of figuring it out with the script I do have on hand? Only through an eye doctor. Some states allow opticians to fit CLs, but the starting point is always with an ophthalmologist or optometrist. Robert Martellaro ~~~~~~~~~~~~~~~~~~ Optician/Owner Roberts Optical Wauwatosa Wi. ~~~~~~~~~~~~~~~~~~ "Science is a way of trying not to fool yourself." - Richard Feynman >I did try Acuvue Oasys and O2 Optix before going with the toric and they >worked and were comfortable. I don't have the packages fromthem however to [quoted text clipped - 4 lines] >a -1.00 and my left I don't remember. Is there not a way of figuring it out >with the script I do have on hand? You can't buy lenses online without a valid prescription (you'll have to fax a copy to them before the order will be completed). The optometrist is being paid to examine your eyes and give you a prescription. You don't have to buy contacts from him.  Signature- Mike Ignore the Python in me to send e-mail. I am in Canada and have bought prescription lenses online and you do not fax your script to them, you just fill in the fields required. My lenses were fitted by an optician and my eyes have been examined by an optometrist, I have also tried all kinds of trial lenses.I was fitted with both regular spherical and toric lenses fitted and at the time (2 months ago) I decided to go with the toric. I now want to go back to the Oasys, because of comfort, but don't remember the power I had in my left eye (my right was a -1.00) and all I have is the toric lens package. I thought based on my script for the toric lenses it could be figured out in a regular sphere power so I can order them online. I don't need another eye exam it has only been 2 months. It seems getting lenses in Canada may be a little different. >>I did try Acuvue Oasys and O2 Optix before going with the toric and they >>worked and were comfortable. I don't have the packages fromthem however to [quoted text clipped - 7 lines] >The optometrist is being paid to examine your eyes and give you a >prescription. You don't have to buy contacts from him. > If I ask my eye > care provider he of course will want me to get the contacts through him but I > can order them online for half the price which is why I haven't asked him. if you live in the US this practice is illegal. after you are fit in a brand of CL that work for you (meaning that they fit your eye well, that they are comfortable to you, and that they provide good vision), federal law states that the eye doctor MUST provide you with a written prescription. you can take your prescription and purchase the contacts where ever you please. without a written prescription, you will be unable to obtain the contact lenses from any reputable source. some internet businesses used to sell them without a prescription until a couple of years ago but now they are liable under the same federal law to stiff penalties unless they can verify a prescription from your doctor. just tell your eyecare provider that you prefer the non-toric spherical lenses and they should give you a prescription-- provided that the lens brand you want did in fact fit your eye appropriately and that your exam wasn't such a long time ago that your prescription might have changed. choosing a satisfactory contact lens brand is something you need to do properly within a short time of your exam. what brand of toric are you wearing? many brands of toric lenses are less expensive than Acuvue Oasys is. Dear Friend, As previously posted on sci.med.vision, this prescription can be converted to spherical-equivalent. Just take 1/2 the astigmatic value, and add it to the "spherical" component. 0.75 = 0.375 So: -0.5 -0.375 = -0.875 spherical equivalent for your left eye. Both these prescriptions are very low in strength. You visual acuity is probably about 20/40 or so. As one OD suggested, you could "round" the spherical-equivalent to -1.0 diopters, and have 20/20 vision. You should talk to your OD about this possibility. > I have slight astigmatism in both eyes but was told I can wear regular > spherical lenses rather than toric if I prefer. My current lenses are toric [quoted text clipped - 5 lines] > Left sph -.50 cyl -.75 ax 170 > Right sph -.75 cyl -.75 ax 170 > -- > Message posted via MedKB.comhttp://www.medkb.com/Uwe/Forums.aspx/vision/200704/1 Dear Lady Nuss, To convert to spherical equivalent (left eye), just do this: Take 0.75 / 2 = 0.375 Then add to 0.5, or -0.875 diopters. You can round this up to -1.0 diopters. This is a very low-power prescription. With no lens you probably have 20/30 to 20/40 vision. A -1.0 should work. Check with your OD about this issue. Otis > I have slight astigmatism in both eyes but was told I can wear regular > spherical lenses rather than toric if I prefer. My current lenses are toric [quoted text clipped - 8 lines] > -- > Message posted via MedKB.comhttp://www.medkb.com/Uwe/Forums.aspx/vision/200704/1 Dear Lady, You can convert your script to spherical equivalent by taking 1/2 the astigmatic part, and adding it to the "spherical". Specifically, for the left eye: 0.75 / 2 = 0.375 -0.5 - 0.375 = 0.875 You can round this to -1.0 diopters. You prescription is weak. If you checked your Snellen you could probably read the 20/30 to 20/40 line with no lens. You can talk to your OD about this issue. > I have slight astigmatism in both eyes but was told I can wear regular > spherical lenses rather than toric if I prefer. My current lenses are toric [quoted text clipped - 8 lines] > -- > Message posted via MedKB.comhttp://www.medkb.com/Uwe/Forums.aspx/vision/200704/1 > I have slight astigmatism in both eyes but was told I can wear regular > spherical lenses rather than toric if I prefer. My current lenses are toric [quoted text clipped - 5 lines] > Left sph -.50 cyl -.75 ax 170 > Right sph -.75 cyl -.75 ax 170 Don't bother. You will not see as well and you will get better results with glasses. If you don't want either of those, go for LASIK. If you're not a good LASIK patient, go without anything on. You might like that. w.stacy, o.d. |
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