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  • astigmatism, glasses size and axis degrees

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    Old 01-25-2008, 08:50 PM   #1
    simon1972
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    astigmatism, glasses size and axis degrees

    Hello. I have astigmatism and I recently purchased a new pair of glasses, I did the normal control before buying them to check if there was any change but the formula remained very similar, however I don't feel quite right about them. It's probably the change and I have to use the glasses for a while, but I'm not sure if the size of the glasses makes any difference, since this new pair is smaller in height, does this matter for astigmatism? also, I'm not very sure the axis is correct, because I turn the glasses slightly and the vision in my left eye gets a bit better, so how important is the axis? does a single degree matters or there's certain tolerance?



    Thanks for your time.

     
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    Old 01-26-2008, 05:27 AM   #2
    brianmf
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    Re: astigmatism, glasses size and axis degrees

    Quote:
    Originally Posted by simon1972 View Post
    Hello. I have astigmatism and I recently purchased a new pair of glasses, I did the normal control before buying them to check if there was any change but the formula remained very similar, however I don't feel quite right about them. It's probably the change and I have to use the glasses for a while, but I'm not sure if the size of the glasses makes any difference, since this new pair is smaller in height, does this matter for astigmatism? also, I'm not very sure the axis is correct, because I turn the glasses slightly and the vision in my left eye gets a bit better, so how important is the axis? does a single degree matters or there's certain tolerance?
    Thanks for your time.
    I'm not an expert in optics but, from experience, I would say that it is to be expected that the smaller the lens the more critical is has to be for astigmatism because the lens grinder has to effectively squash the correction into a smaller space. However, if your acuity improves simply by turning the lens, that does suggest something is not quite correct. It could just be that your brain has to adjust to the small change in prescription but a call or visit to your optometrist should provide the answer.
    It always takes me a week or two to get used to new glasses. I have astigmatism and fairly strong lenses (+5.0).

     
    Old 01-27-2008, 12:21 AM   #3
    tramore35
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    Re: astigmatism, glasses size and axis degrees

    Sometimes if you have a change in the axis of your astigmatism it can take a week or so to adjust. One degree can matter if you have significant astigmatism. It's not so critical if you don't. I would go back to my doctor. It is possible that the lens twisted a little in the frame or your glasses are not sitting perfectly level. Both of these problems may cause your vision to be blurry. The depth of the frame comes into play more if you are wearing a progressive (no line) lens.

     
    Old 01-27-2008, 08:45 PM   #4
    simon1972
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    Re: astigmatism, glasses size and axis degrees

    Thanks for your answers .

    I checked the glasses and they were off by 4 degrees, and I have high astigmatism I think, formula is 2 x 5 x 170 and 3 x 6.25 x 13 if I'm remembering correctly. I already asked for a change and the new glasses feel much better, however I do still feel I need some time to adjust. Its funny, the other glasses were completely scratched and the left lens for some odd reason was opaque, but I was so used to them that the new glasses feel odd, specially glare and reflections. I'll wait a week anyway and evaluate how I adjust. Thanks again for your time.

     
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