Do contact lenses cause astigmatism?
nobody
I've started wearing Focus Night&Day contact lenses for about two weeks now.
I was not happy with my visual accuity after first trail pair compared to my
glasses. There seemed to be ghosting mainly. Well I went back in for my
follow-up and the OD said I have a astigmatism that the Night&Day lenses
can't correct. Now I've never been diagnosis with one before -in fact- I've
been told I had a very simple prescription. So what I'm wondering is- Do
contact lenses cause this or do glasses naturally mask astigmatism to some
degree? Or are some contats better than others?
He did up my power slightly in both eyes so now the lenses are closer to my
spectacled eyesite. I really like the Night&Day for comfort. Does anyone
know when a toric is coming out?
My prescription is -2.25 left eye and -2.00 right eye.
--
Jim
Pipino Il Breve
Contact lenses cannot cause astigmatism. Soft ones in particular surely
have not the strength to alter the shape of your cornea.
Glasses cannot mask astigmatism.
I heard toric form for Night and Days is being planned. Don't know when
it's due. I guess the price is going to be crazy though.
Do you still see well through your old glasses? How strong is your
astigmatism now? Some doctors say "no astigmatism" when it's -0.50 or
less, while some others do tell you that you have astigmatism.
Strange thing that you experience a ghosting by Night and Days. In
theory that could be uncorrected astigmatism but then why don't you see
it with glasses?
[Not a doc]
nobody
Based on your answers I am really perplexed what is happening. Yes, I still
see fine in my old glasses when I put them on. I don't have my astigmatism
prescription yet because he said I could try the new trial pair for a week
to see if I like this. He held up lens to my eye with my contacts in and
things did look much better. He said that the lens was correcting an
astigmatism.
I wore soft contacts several years ago, and although they made my eyes feel
tired and uncomfortable, I don't remember any vision change. The Night & Day
feel stiffer than those old contacts were so I wasn't sure if that was a
contributing factor or not.
Jim
"Pipino Il Breve" <pipino...@abc.com> wrote in message
news:bj7t6...@enews3.newsguy.com...
Diet Rich
> > have not the strength to alter the shape of your cornea.
Even orthokeratologic (sp?) contacts that are *meant* to alter the
shape of the cornea don't ensure a permanent effect let alone generic
lenses, soft or rigid.
However, the more rigid lenses retain their shape and compensate for
the irregularity of the astigmatic cornea, so a person with mild
astigmatism will see better through non-toric Night&Day than through
soft lenses. Eg in my case I see better through -6.5 Night&Day than
through -5.75 -0.75 soft toric lenses. I would see very poorly through
-6.5 soft lenses. I'd say the rigidness of Night&Day contacts corrects
up to -1 of astigmatism.
MS
I believe my eye problem was first only myopia, no astigmatism. When I was
in my early 20s, when I first switched from glasses to contacts, an OD
convinced me to try orthokeratology, promising being able to see without
glasses or lenses, just occasional wear of the "retainer" lenses.
Needless to say, that didn't happen. Perhaps a slight improvement in the
myopia, but I was still highly myopic, and still couldn't function at all
without corrective lenses.
Yet---I believe that is when I began to get astigmatism, some distortion,
more halos around objects, etc.
Could it be that the too flat rigid lenses can induce astigmatism?
Is orthokeratology a hoax? Does anyone really benefit from it, other than
the doctor's bank account? Has it improved a lot?
"Pipino Il Breve" <pipino...@abc.com> wrote in message
news:bj7t6...@enews3.newsguy.com...
Tom S
hard contacts that fit even worse than the ones that I've got now for about
a month and my astigmatism went from -1.75 down to -1.25 and stayed there.
Dr. Leukoma
news:bj81dq$gab$1...@sun-news.laserlink.net:
> Thanks for the reply.
>
> Based on your answers I am really perplexed what is happening. Yes, I
> still see fine in my old glasses when I put them on. I don't have my
> astigmatism prescription yet because he said I could try the new trial
> pair for a week to see if I like this. He held up lens to my eye with
> my contacts in and things did look much better. He said that the lens
> was correcting an astigmatism.
>
> I wore soft contacts several years ago, and although they made my eyes
> feel tired and uncomfortable, I don't remember any vision change. The
> Night & Day feel stiffer than those old contacts were so I wasn't sure
> if that was a contributing factor or not.
>
> Jim
>
Absolutely contact lenses can cause/reduce/change astigmatism via changing
the anterior surface of the eye. Several articles have been published
regarding the effect of stiff soft lenses - such as Focus N&D - on the
corneal shape. These are side-effects, often unintended, and do not always
occur.
DrG