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Medical Forum / General / Vision / June 2006contacts versus eyeglasses prescription
Hello, I recently went to an eye center to get contact lens and an eyeglass prescription. The eyeglass prescription was: RE: -2.50 +0.25 145 (sph/cyl/axis) LE: -2.50 +1.25 020 However, when I went to get my contacts prescription, they gave me two lenses with a different prescription. The left lens is a toric lens. The right lens is non-toric. I noticed when looking at the exterior packaging of the contact lens that the prescription for one of the lens was -1.25 and the other was -2.25. Thus, I believe the non-toric lense appears to be substantially weaker. I noticed almost right way that vision through the right lens is fairly blurry. However, they pushed me out the door without addressing this issue, and they're rmaking it hard to reschedule, claiming that your vision can be blurry to start with anyways. However, I find it hard to believe that the difference between the eyeglass and contact lens prescription could vary so greatly: -1.25 versus -2.50. Also, my eyes do not seem to be watering or reacting to the lense. Is it normal for there to be such a great difference? Should I push to reschedule? M >I recently went to an eye center to get contact lens and an eyeglass >prescription. The eyeglass prescription was: [quoted text clipped - 8 lines] >was -1.25 and the other was -2.25. Thus, I believe the non-toric lense >appears to be substantially weaker. If your right contact lens is a -1.25 sphere (i.e., not toric), then you (probably) were given the wrong prescription. >I noticed almost right way that vision through the right lens is fairly >blurry. However, they pushed me out the door without addressing this >issue, and they're rmaking it hard to reschedule, claiming that your >vision can be blurry to start with anyways. Perhaps you got hit with a variation of "Seven, Four, Out The Door"? [snip] >Is it normal for there to be such a great difference? Should I push to >reschedule? Normally, I would tell you to give it at least a few days, but there is a big enough of an index of suspicion that there is a non-intentional error in the contacts you were given that I would, at least, recommend the following: Walk into the office and tell them your complaint, "Vision is blurry in the right eye with the contacts." Show them your glasses prescription, pointing to the RE numbers and then show them your contact lens prescription and boxes of lenses again pointing to the -1.25 on the box. Ask them if they accidentally gave you the wrong contacts. If they claim all is perfect, I would schedule a follow-up appointment with the doctor to investigate your complaint. > Hello, > [quoted text clipped - 9 lines] > packaging of the contact lens that the prescription for one of the lens > was -1.25 and the other was -2.25. The toric lens would probably have five numbers on it. The -1.25 was the sphere. Soft contact lenses are written using minus cylinders making your prescription -1.25 -1.25 x 110. You did not see (or at least mention in your post) the other numbers. Toric contact lenses occasionally do not fit well on the initial fitting as they sometimes do not rotate in the anticipated direction. After a week of wear it is easier to tell if it is the right lens. Ted > > Hello, > > [quoted text clipped - 13 lines] > the sphere. Soft contact lenses are written using minus cylinders > making your prescription -1.25 -1.25 x 110. That is correct, although it is in fact THREE numbers, not five. -2.25 for the eye that had a spectacle Rx of -2.50 is certainly possible. So, if those are the numbers on the packaging, then you're on the right track. > Toric contact lenses > occasionally do not fit well on the initial fitting as they sometimes > do not rotate in the anticipated direction. After a week of wear it is > easier to tell if it is the right lens. Ted, it takes but a couple of hours, sometimes as little as a half hour for the lens to settle and then be able generate a new lens power which adjusts for the rotation. For a brand new lens wearers, I usually give it two days *if the first lens is reasonably close* to what I expect. For most folks, I like to have them back to re-check the powers later the same day if possible. Things go better for patients, and me ;-) when they get as close to immediate gratification as possible. LB O.D. > > The toric lens would probably have five numbers on it. The -1.25 was > > the sphere. Soft contact lenses are written using minus cylinders > > making your prescription -1.25 -1.25 x 110. > > That is correct, although it is in fact THREE numbers, not five. Dear Larry: Don't neglect the base curve and diameter of the lens. Not all lenses specify these but you are incorrect, it is in fact FIVE numbers, not three. Read the label. Ted. >> However, when I went to get my contacts prescription, they gave me two > lenses with a different prescription. The left lens is a toric lens. [quoted text clipped - 4 lines] > > M If you convert your prescription to minus cyl. format, it would read:- R: -2.25/-0.25 X 55 L: -1.25/-1.25 X 110 You did not say what the cylindrical component was for the toric lens. Leaving out the cylinders of the right lens should cause only very slight bluring, Are you sure yo did not mix your lenses, that is Right on left and left on right? Go back to the Doc to sort it out. Roland J. Izaac optometrist > Hello, > [quoted text clipped - 21 lines] > Is it normal for there to be such a great difference? Should I push to > reschedule? Your glasses prescription was written in plus cyl form and the contacts are in minus cyl form. I would guesstimate contact lens powers required to be: R -2.25 non toric L -1.25 toric ( -0.75 or -1.00 or -1.25 cylinder) If the vision is blurry, return to your fitter. Or its possible you have reversed left and right, try them the other way. Dr Judy |
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