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Medical Forum / General / Vision / April 2005

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GPs vs FNDs

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Andrew Chew - 05 Apr 2005 14:09 GMT
Is it possible to sleep in GPs as one sleeps in Focus NDs?

How often does one need to clean extended wear GPs?
Dr. Leukoma - 06 Apr 2005 12:18 GMT
You've heard of overnight ortho-k?

There are RGP materials approved for continuous wear.  Hyper-DK RGP
lenses were available long before hyper-DK soft lenses.  Menicon Z is
approved for 30 days continuous, just like the Focus N&D.  Don't expect
the two lenses to feel the same on your eye, though.

DrG
Andrew Chew - 06 Apr 2005 13:50 GMT
> You've heard of overnight ortho-k?
>
[quoted text clipped - 4 lines]
>
> DrG

Thanks. I've heard RGPs take some getting used to but they do seem a lot
cheaper and sharper than soft lenses. I've heard they tend to pop out easily
if the eyes have no astigmatism. Is this true?
LarryDoc - 07 Apr 2005 18:39 GMT
> > You've heard of overnight ortho-k?
> >
[quoted text clipped - 8 lines]
> cheaper and sharper than soft lenses. I've heard they tend to pop out easily
> if the eyes have no astigmatism. Is this true?

No, it is not. Whether or not a lens "pops out easily"  is a function of
how well the lens is fit.  It is true that for some people, achieving
that "perfect" fit is not possible due to various anatomical issues.

Although RGP  (now called GPs, 'cause the R-rigid part erks some folks)
lenses do "take some getting used to", many people, not all, can and do
find them to be perfectly comfortable. Some, especially people with
moderately dry eyes may find RGPs *more* comfortable than soft lenses.

Generally, although not always, RGP lenses provide sharper vision and
yes, they are less expensive, mostly because they can last for a year,
sometimes even two years before replacement.  But with one caveat: if
you loose or break them, they might end up to be more expensive than
soft lenses.

I personally use RGP multifocals, one pair of which is in Menicon
material, and Focus N&D lenses. I am not comfortable sleeping in the RGP
and can sleep in N&D, but only for a few days at a time. The RGP optics
are outstanding, the comfort is not. The N&D optics is tolerable, the
comfort is outstanding. But that's me.  I've many patients who use N&D
24/7, most about 2 weeks between cleaning, and very, very few who sleep
in RGPs.

"Sometimes, you can't always get what you want, but if you try,
sometimes you can get what you need."

--LB, O.D.
Andrew Chew - 08 Apr 2005 18:48 GMT
> I personally use RGP multifocals, one pair of which is in Menicon
> material, and Focus N&D lenses. I am not comfortable sleeping in the RGP
[quoted text clipped - 3 lines]
> 24/7, most about 2 weeks between cleaning, and very, very few who sleep
> in RGPs.

Yeah, so far Focus N&Ds are great. It sounds like Menicon Z might be just as
good too, so I might get a pair of those.
 
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