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Medical Forum / General / Vision / April 2005Quesion about power -5.25 for contacts
I'm wondering what sort of differences I would see between -5.00 and -5.25 power for contact lenses? I'm asking because I am currently wearing -5.25 and just had an eye exam and was prescribed -5.00 instead. I am wondering if there is much difference between the two and what I differences I might expect with the -5.00 contacts? The difference is 0.25/5.25 less power...or slightly less than a 5% decrease. If you could see as well with a prescription that is 5% less, would you? DrG sure, i suppose i would. but i'm worried that i'm used to the -5.25 ones and when i get the -5.00 ones in it may look worse? is this crazy to think this? he did mention that the -5.00 would be better for comfort in computer work and reading. but how will it affect far distances? > The difference is 0.25/5.25 less power...or slightly less than a 5% > decrease. If you could see as well with a prescription that is 5% > less, would you? > > DrG If they are disposable, you could ask for a trial lens. I assume that most eye doctors do as I do, which is to give their patients the best possible distance vision, without over-correction. DrG Are the -5.25 contacts physically thicker than the -5.00 ones? I'm asking because the -5.25 soft toric contacts I have seem to not move around on my eye when I blink as much as the -5.00 ones. > If they are disposable, you could ask for a trial lens. > > I assume that most eye doctors do as I do, which is to give their > patients the best possible distance vision, without over-correction. > > DrG Not noticeably. Any difference such as you have noticed are not due to just power difference, unless the manufacturer has screwed up. More likely, you screwed up, your doctor screwed up, or someone in between screwed up... w.stacy, o.d. > Are the -5.25 contacts physically thicker than the -5.00 ones? > [quoted text clipped - 7 lines] >> >>DrG > Are the -5.25 contacts physically thicker than the -5.00 ones? In the strictest sense, yes, but the difference is way too small to affect movement. > I'm asking because the -5.25 soft toric contacts I have seem to not move > around on my eye when I blink as much as the -5.00 ones. Then there's a difference in how they fit, but it isn't due to thickness. If soft contacts move too much, they often feel dry and uncomfortable. Let your doctor know if they're uncomfortable. -MT > sure, i suppose i would. but i'm worried that i'm used to the -5.25 ones > and when i get the -5.00 ones in it may look worse? is this crazy to > think this? > > he did mention that the -5.00 would be better for comfort in computer > work and reading. but how will it affect far distances? Well go find out! Why don't you simply stop by the doc's office with your -5.25 lenses in and ask to view the world through a +.25 hand-held lens ? You will see instantly the effect, or lack thereof. No change, then clearly (pun intended) you will do better with the -5.00. Blurry, then better to stick with the -5.25. If it IS blurry, then it's a personal preference issue if the distance loss of acuity is worth the possible (if you're over 45 or so) improvement at near. --LB, O.D. If you actually need -5.00 lenses to see 20/20 in the distance, but have become used to -5.25, then you might initially experience a little distance blur with the new lower -5.00 prescription. This will pass within a few days as your eyes readjust to the proper prescription. Celebrate you new lower prescription! Your eyes have gotten better and you have personally disproven Otis' theory of "the wretched minus" (inside joke-- just forget it). -------------------------------- > sure, i suppose i would. but i'm worried that i'm used to the -5.25 ones > and when i get the -5.00 ones in it may look worse? is this crazy to > think this? > > he did mention that the -5.00 would be better for comfort in computer > work and reading. but how will it affect far distances? Either that or the original -5.25 was mis prescribed for me a few years ago when I got it. Follow up: I got the -5.00 contacts in and also still have my old -5.25 contacts on hand. I can tell zero difference between the two, they are both quite crisp and clear both for closeup and far. So I guess this means that the -5.00 is the best one to use since it's less correction? Is it strange that I can see equally as well with both? > If you actually need -5.00 lenses to see 20/20 in the distance, but have > become used to -5.25, then you might initially experience a little distance [quoted text clipped - 13 lines] > > he did mention that the -5.00 would be better for comfort in computer > > work and reading. but how will it affect far distances? > So I guess this means that the -5.00 is the best one to use since it's > less correction? > > Is it strange that I can see equally as well with both? Not at all. Having them 0.25 too strong may not cause noticeable symptoms until you're 35 or 45. It isn't at all unusual for people to improve a notch or two when their nearsightedness stops getting worse. -MT
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