Base curve too steep?
K8win...@aol.com
told me to get an 8.7 base curve in the Optima FW disposables but to get a
8.3 base curve in the Acuvue 2's. Does anyone know why? Would a contact with
a lesser base curve fit more loosely? Thanks.
--
Posted from imo-d02.mx.aol.com [205.188.157.34]
via Mailgate.ORG Server - http://www.Mailgate.ORG
Mike Tyner
numbers mean steeper lenses with a tighter fit. Too tight is dangerous, too
loose is uncomfortable.
An 8.7 in one brand might fit like an 8.3 in another. He's saying that the
8.7 B&L Optima is barely tight enough.
-MT
<K8win...@aol.com> wrote in message news:59.22a96b...@aol.com...
Michael Pace
manufacturer has designed the lens. The base curves will not always be the
same from brand to brand. Your doctor decides on lens brand and base curve
based on how the lens fits your particular eye during the trial fit.
<K8win...@aol.com> wrote in message news:59.22a96b...@aol.com...
Bev
>
> Different brands of soft lenses fit differently depending on how the
> manufacturer has designed the lens. The base curves will not always be the
> same from brand to brand. Your doctor decides on lens brand and base curve
> based on how the lens fits your particular eye during the trial fit.
What if the base curve isn't steep enough? I've been wearing contacts that
just don't fit for at least a year and a half. Long sad story, but
somebody here suggested that perhaps the simply don't make lenses with a
base curve that was steep enough. (Flat feet and pointy corneas, who needs
a Halloween costume?) The optician figured that after 3 tries what I had
was good enough in March 1999, and maybe he really couldn't do any better.
I'm certainly not going to go back to him, though.
So here's my prescription. Any chance that somebody makes anything steeper
now? Seems silly to try again with a different guy when the technology
hasn't changed.
Westcon (model unknown, but maybe Horizon Soft Specialty Division II, very
thick, supposed to last for at least a year; ought to go lots longer than
that since I wear them maybe once a week now...)
R: +3.25 -1.25 100 8.3 14.5
L: +5.25 -2.25 80 8.3 14.5
I'd really like to try monovision (+2.25 add for my glasses, god knows what
it should be for contacts), with my left eye being used for reading...
--
Cheers,
Bev
---------------------------------------
That's my opinion. Ought to be yours.
Jkumar167
>R: +3.25 -1.25 100 8.3 14.5
>L: +5.25 -2.25 80 8.3 14.5
>
If you knew your K readings (corneal curvature) it might be easier to help..
But I DO know that I also have a toric Rx (astigmatism) and a steep cornea, and
I have never found a contact that works that well...and I'm an optometrist, so
I've had access to them all. There just aren't that many decent toric
(astigmatism) lenses made that fit a steep cornea. Your case is complicated
by the fact that you are quite a bit farsighted, which cuts down the available
lenses even more...(The far-sighted lenses tend to be made in the flatter base
curves...)
Go to an expert contact lens fitter, and seriously consider a rigid gas
permeable lens.
Its simple supply and demand: we have a relatively uncommon combination of Rx
and corneal curvature...so not that many lenses made that will work (RGPs are
custom made, so they would work....There are also a few custom made soft
lenses, but they tend to be very pricey and hard to get....)
trinity
I've had lenses prescribed for 8.4/14.0 and for 8.6/14.2 at another
occasion. In hindsight, they seemed to fit fine either way...
"Mike Tyner" <mty...@mindspring.com> wrote in message
news:8tmfbm$9m9$1...@slb2.atl.mindspring.net...
Mike Tyner
fit too tight, and some of them could have permanent consequences. Usually
not.
Too-tight lenses are usually _very_ comfortable for the first couple of
hours, but without circulating the tears underneath, you'll get an organic
soup of tear proteins and cellular waste products that becomes toxic after a
while. Typically the irritation is isolated to just the cornea and a ring of
white under the lens, which becomes the so-called "red ring".
In the microscope, the cornea looks toxic (steamy, stippled with signs of
toxicity - little holes in the epithelial layer that allow fluid and germs
to penetrate.) Often the eyes aren't uncomfortable until lenses are
_removed_. Vision may decrease from edematous haze or even topographic
distortion. Glasses might not "work right" for a while after you remove
contacts.
Usually these problems clear in 2-12 hours but when it happens every day,
the cornea becomes fragile and often erodes easily, gets scarred, or becomes
intolerant to contacts. Those are some of the "dangers."
-MT
"trinity" <trini...@excite.com> wrote in message
news:l_NM5.56534$w3.40...@typhoon.nyc.rr.com...