RGP question?

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redwood - 12 Aug 2006 17:51 GMT

I have been wearing a RGP for about 2 years after switching from soft.
I only wear one lens as I had laser surgery in the other eye, it didn't
go well so I didn't risk having my other eye treated and wear a lens
instead.

During my recent eye check the optician checked the lens fitting and
said the RGP looked a little loose and would steepen the curve slightly.
The old lens B/C was 7.70 and the new one is 7.65. The vision from the
old lens also appeared to be slightly long sighted but the optician said
he will leave the power the same (-8.25) as the steeper curve will
compensate.

I now have the new lens and although I notice a big improvement in my
reading and near vision, my distance vision in that eye is now fuzzy and
appears to be short sighted. I go back in 2 weeks to have the lens
checked. If I keep wearing this lens will my eye or brain learn to
adjust or do you think I will need extra power adding. I like the feel
of this new lens and my near vision is much better which if possible I
don't want to lose by adding more power.

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Ace - 12 Aug 2006 22:47 GMT

> I have been wearing a RGP for about 2 years after switching from soft.
> I only wear one lens as I had laser surgery in the other eye, it didn't
[quoted text clipped - 15 lines]
> of this new lens and my near vision is much better which if possible I
> don't want to lose by adding more power.

You may get a thin pair of glasses to wear over your lasik eye and
virgin eye with the contact for stuff like driving or watching movies.
If you can see well from near without readers, that is great. My
condolences for your un-neccessary lasik, much more so among contact
wearers. Smart move to only get one eye done, something all contact
wearers should do, but frankly they wont be happy as their vision with
contacts is much better, so its best to avoid lasik and just stick to
contacts.

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LarryDoc - 13 Aug 2006 03:25 GMT

> You may get a thin pair of glasses to wear over your lasik eye and
> virgin eye with the contact for stuff like driving or watching movies.
[quoted text clipped - 4 lines]
> contacts is much better, so its best to avoid lasik and just stick to
> contacts.

We thank you so much for yet another insightful commentary on something
you know absolutely nothing about.

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Robert Kopp - 14 Aug 2006 04:00 GMT

>> You may get a thin pair of glasses to wear over your lasik eye and
>> virgin eye with the contact for stuff like driving or watching movies.
[quoted text clipped - 7 lines]
> We thank you so much for yet another insightful commentary on something
> you know absolutely nothing about.

I don't think anyone would dispute that hard contact lenses provide the best
possible vision, assuming of course that one needs correction. LASIK is
more convenient, and the results are usually satisfactory, though in some
cases they are not.

Signature

Robert T. Kopp
http://analytic.tripod.com

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LarryDoc - 12 Aug 2006 22:54 GMT

First, allowing some time to adapt to the new lens curvature/fitting and
power is a good idea. If you find that your distance vision is still a
little off, then have that adjusted. In the office, have the
practitioner (I gather your in the UK) demo the new lens power with a
hand-held lens and see how it affects your near vision. If it declines,
you can choose to leave it is and try to adjust to the monovision
correction or try a multifcoal contact lens.

LB, O.D.

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redwood - 04 Sep 2006 18:15 GMT

>> I have been wearing a RGP for about 2 years after switching from
>> soft.
[quoted text clipped - 36 lines]
>
> LB, O.D.

Yes the eye doc held lenses over the RGP and decided to up the power
from -8.25 to -8.75. I was concerned that the extra power would hinder
my reading vision but having worn the new lens for a few days my near
vision is better with this lens than my previous one. I'm surprised that
slightly tweaking the diameter from 7.70 to 7.65 would require two jumps
in power. He also altered the AEL from 0.10 to 0.08 which also feels
much more comfortable. If anything I would say that the my distant
vision is still very slightly on the short sightedness but overall I am
very happy with this lens.

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redwood - 04 Sep 2006 18:20 GMT

> slightly tweaking the diameter from 7.70 to 7.65 would require two
> jumps

Oops, that should read base curve. The diameter is 9.5

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Jan - 04 Sep 2006 19:41 GMT

redwood schreef:

>>> I have been wearing a RGP for about 2 years after switching from soft.
>>> I only wear one lens as I had laser surgery in the other eye, it didn't
[quoted text clipped - 15 lines]
>>> of this new lens and my near vision is much better which if possible I
>>> don't want to lose by adding more power.

> Yes the eye doc held lenses over the RGP and decided to up the power
> from -8.25 to -8.75. I was concerned that the extra power would hinder
[quoted text clipped - 5 lines]
> vision is still very slightly on the short sightedness but overall I am
> very happy with this lens.

It is not uncommon your lenses are polished by yourself with your
(abrasive?) cleaning solution to a more stronger in minus power lens
in those two years of wearing them.

This could be the explanation for the pseudo hyperopic outcome when you
are tested with those lenses placed on.

A change in BCR of 0,05 mm gives a 0,25 dpt change in lens power, in
your case from 7,70 to 7,65 it's an add of +0,25 which should be
compensated with an addition in lens power of -0,25 dpt.

Your original lens power -8,25 should be changed in -8,50.
I suppose there was also a little change needed on top of it so you
finally got a lens which compensate for a real change in ametropia of
0,25 dpt, nothing to be worried about.

PS, I don't believe my own eyes, I wrote "pseudo hyperopic" it is like
reading Otis rubber definitions, boys and girls excuses in advance.

Jan (normally Dutch spoken)

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