Toric contact power increments

I'm trying to get into some toric contacts, but I also want to keep my
current prescription without overcorrecting. I'm looking for -0.5x180
and -1x180. My eye doc said the minimum possible is -0.75, and just
surveying online stores it looks like they all go in 0.5 increments, so
I couldn't hit the -1 either.

Is there any brand that could hit my Rx exactly? I can only assume
that most people just over or undercorrect by 0.25 and don't care, but
I'm pretty sensitive to it. Thanks.

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how myopic are you? If all you have is a bit of astigmastim, I dont see
why you even need correction. Many people are still 20/20 or 20/25 with
-1 astigmastim or less.

Up to -0.75 to -1.00 cyl at axis 180 is ususally ver easily masked by a
conventional lens. The stronger the myopia or hyperopia, the less
likely the need for a cyl correction at 180. If your prescription is
only astigmatism, then it may be necessary to wear those powers.
Generally, -0.75 cyl s is the lowest power available.

Dr. Tom

if you can't answer peoples questions then why even bother to respond.
go away twit.

(E-Mail Removed) wrote:

> Up to -0.75 to -1.00 cyl at axis 180 is ususally ver easily masked by
> a conventional lens. The stronger the myopia or hyperopia, the less
> likely the need for a cyl correction at 180. If your prescription is
> only astigmatism, then it may be necessary to wear those powers.
> Generally, -0.75 cyl s is the lowest power available.
>
> Dr. Tom

Thanks for the replies. I'm basically all astig; my spherical is +0.25
and PL. I guess there's few enough people like me that there's no
market.

--

In article <AvYYf.909554$xm3.688525@attbi_s21>,
"Charles" <(E-Mail Removed)> wrote:

> (E-Mail Removed) wrote:
>
> > Up to -0.75 to -1.00 cyl at axis 180 is ususally ver easily masked by
> > a conventional lens. The stronger the myopia or hyperopia, the less
> > likely the need for a cyl correction at 180. If your prescription is
> > only astigmatism, then it may be necessary to wear those powers.
> > Generally, -0.75 cyl s is the lowest power available.
> >
> > Dr. Tom
>
> Thanks for the replies. I'm basically all astig; my spherical is +0.25
> and PL. I guess there's few enough people like me that there's no
> market.

Depending upon your interest, it might be worth trying whatever your OD
recommends as best. A pair of .75s sounds attractive to me, because
then you don't have to worry about getting them mixed up!

As others have posted, toric contact lens powers aren't always the same
as glasses astigmatism powers. You'll need to get some, stick them in
and then get overrefracted to find out what they do to *your* eyes.

On the other hand, if you are as picky as it sounds like you are, it
might just not be worth the hassle.

--
Dan Abel
(E-Mail Removed)
Petaluma, California, USA

"On the other hand, if you are as picky as it sounds like you are, it
might just not be worth the hassle."


thats what I thought. He probably sees 20/20 or 20/25 without
correction. Toric contacts would cost him money, cause some discomfort,
blur vision when they rotate, have a small risk of infection, etc. He
can try but its not gonna make a difference since they wont be the
right power and with his pescription so low, theres no market for it.

People "like you" that love a really accurate correction do best with
RGP contacts. If you wore a sherical RGP with aspheric peripheral
curves you could see at least as well as you have ever seen with
glasses, perhaps even better. I have quite a few patients that have
..50 to 1.0 D cylinders who read the 20/10 line with their aspheric RGPs
on!

(E-Mail Removed) wrote:

> People "like you" that love a really accurate correction do best with
> RGP contacts. If you wore a sherical RGP with aspheric peripheral
> curves you could see at least as well as you have ever seen with
> glasses, perhaps even better. I have quite a few patients that have
> .50 to 1.0 D cylinders who read the 20/10 line with their aspheric
> RGPs on!

Can you give me a ballpark price that I'd expect for something like
that?

--

Reading about RGP, it sounds like since they are rigid, they can
reshape the cornea to some extent and "mask" astigmatism without
actively correcting for it. The one site I read said that up to 3
diopters can be addressed this way sometimes. Does it ever make sense
(with a low astigmatism-only Rx) to prescribe something like a zero
power RGP and let it just reshape the eye rather than correcting it
"optically"?

(E-Mail Removed) wrote:

> People "like you" that love a really accurate correction do best with
> RGP contacts. If you wore a sherical RGP with aspheric peripheral
> curves you could see at least as well as you have ever seen with
> glasses, perhaps even better. I have quite a few patients that have
> .50 to 1.0 D cylinders who read the 20/10 line with their aspheric
> RGPs on!



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