over power side effect

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Miko - 28 Mar 2004 14:06 GMT

Hi,

What's the side effect of getting a glass or contact that is
-0.25 higher than your power... assuming there is no headache.
I mean.. would it cause your sight to get worse by -0.25 later
(eg.. the eyes can change to match the increased power of the
glass/contacts). I'm wearing a contact that is -0.25 above my
power but suffering no headache. I'm just concerned what other
side effect it can cause. Thanks.

miko

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Dr. Leukoma - 28 Mar 2004 14:45 GMT

> Hi,
>
[quoted text clipped - 7 lines]
>
> miko

No. How do you know that your power is -0.25 too strong? Because you can
see just as well with a lens that has -0.25 less, and if you can see just
as well with -0.25 less, then by definition you haven't gotten more
nearsighted. Minor fluctuations in power are fairly common.

DrG

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Miko - 28 Mar 2004 20:38 GMT

Well. My contacts is originally rated at -8.0 diopters. I get one
with -8.25 diopters just to see what it would be like. It may
be a little too strong.. but I don't encounter headaches. I'm just
concerned my eyes may adapt to the -8.25 lens and become worse
by -0.25. Is there any basis for this?

miko

> > Hi,
> >
[quoted text clipped - 14 lines]
>
> DrG

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Mike Tyner - 28 Mar 2004 17:41 GMT

> I mean.. would it cause your sight to get worse by -0.25 later

For a long time, everybody believed it would. But overcorrecting by small
amounts doesn't make myopia significantly worse, if you ask the professors in
optometry or medicine.

> (eg.. the eyes can change to match the increased power of the
> glass/contacts). I'm wearing a contact that is -0.25 above my
> power but suffering no headache. I'm just concerned what other
> side effect it can cause. Thanks.

If it doesn't cause discomfort, blur at near, or double vision, most doctors
wouldn't consider it harmful.

-MT

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Jan - 28 Mar 2004 18:19 GMT

> Hi,
>
[quoted text clipped - 7 lines]
>
> miko

Besides getting a headache you could get more tired due to accommodation to
correct this little error but normally it is not a problem.
Some people even prefer to be over corrected with a -0.25 dpt giving them
the "feeling" to see sharper (which is not the case)
In very dark circumstances most of the time you even see a little bit
better.
Overall not a big problem when not having headaches or getting tired at the
end of the day

Jan (normally Dutch spoken)

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