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Tony Karp
medicine forum beginner
Joined: 17 May 2005
Posts: 1
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 Posted: Tue May 17, 2005 11:38 am Post subject:
Presbyopia reversing on its own?
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When I was young, I had very good eyesight.
When I passed 40, I started to wear glasses to correct for farsightedness. As I
grew older, the prescription got stronger.
In the last two years (I'm 66), this process seems to be reversing. This has
been confirmed by an optometrist, and now my old driving glasses are my reading
glasses. I can drive day or night without glasses.
The optometrist said that this effect may be a precursor of cataracts.
Anyone know about this effect or where I can find more information on it?
--
Tony Karp, TLC Systems Corp
Techno-Impressionist Museum: http://www.techno-impressionist.com
TLC Systems: http://www.tlc-systems.com |
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Dr Judy
medicine forum Guru
Joined: 07 May 2005
Posts: 304
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| Posted: Tue May 17, 2005 12:25 pm Post subject:
Re: Presbyopia reversing on its own?
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"Tony Karp" <tkarp---@---tlc-systems.com> wrote in message
news:tjsj81tk1gu14ivd4ots5kh299g7hjpu6f@4ax.com...
| Quote: | When I was young, I had very good eyesight.
When I passed 40, I started to wear glasses to correct for farsightedness.
As I
grew older, the prescription got stronger.
In the last two years (I'm 66), this process seems to be reversing. This
has
been confirmed by an optometrist, and now my old driving glasses are my
reading
glasses. I can drive day or night without glasses.
The optometrist said that this effect may be a precursor of cataracts.
Anyone know about this effect or where I can find more information on it?
|
Your optometrist is correct, it is called cataract myopic shift. Your
presbyopia has not reduced however, it is your hyperopia that has reduced.
As the lens in the eye ages it becomes more dense and changes refractive
index and effective power. An increase in power means more myopia or less
hyperopia, thus your driving glasses now work as readers. This is the same
process that eventually results in cataract, cataract are a normal result of
the aging process.
For more detail:
http://www.emedicine.com/oph/topic49.htm
Dr Judy |
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William Stacy
medicine forum Guru
Joined: 01 May 2005
Posts: 1177
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| Posted: Tue May 17, 2005 12:33 pm Post subject:
Re: Presbyopia reversing on its own?
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Probably is; the lens swells during the cataract development, shifting
the refraction toward myopia or less hyperopia. Used to be called
"second sight". Don't worry too much about it, but plan for a minor
surgical fix within a year or two. I went through the process in Jan.
and if I knew then what I know now, I'd have done it sooner. But be
sure to go to a cataract specialist who does stitchless procedures under
anesthetic drops only.
w.stacy, o.d.
Tony Karp wrote:
| Quote: | When I was young, I had very good eyesight.
When I passed 40, I started to wear glasses to correct for farsightedness. As I
grew older, the prescription got stronger.
In the last two years (I'm 66), this process seems to be reversing. This has
been confirmed by an optometrist, and now my old driving glasses are my reading
glasses. I can drive day or night without glasses.
The optometrist said that this effect may be a precursor of cataracts.
Anyone know about this effect or where I can find more information on it?
--
Tony Karp, TLC Systems Corp
Techno-Impressionist Museum: http://www.techno-impressionist.com
TLC Systems: http://www.tlc-systems.com |
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Mike Tyner
medicine forum Guru
Joined: 24 Mar 2005
Posts: 1299
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| Posted: Tue May 17, 2005 4:49 pm Post subject:
Re: Presbyopia reversing on its own?
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"Tony Karp" <tkarp---@---tlc-systems.com> wrote
| Quote: | Anyone know about this effect or where I can find more information on it?
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Generally the process is called "nuclear sclerosis." The crystalline lens
swells, its index of refraction changes, and it becomes less uniform. All of
these contribute to the "myopic shift" that many people experience, usually
after age 60 or so.
-MT |
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Repeating Rifle
medicine forum Guru Wannabe
Joined: 04 May 2005
Posts: 141
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| Posted: Tue May 17, 2005 7:38 pm Post subject:
Re: Presbyopia reversing on its own?
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in article 81rie.3030$M36.2854@newsread1.news.atl.earthlink.net, Mike Tyner
at mtyner@mindspring.com wrote on 5/17/05 11:49 AM:
| Quote: |
"Tony Karp" <tkarp---@---tlc-systems.com> wrote
Anyone know about this effect or where I can find more information on it?
Generally the process is called "nuclear sclerosis." The crystalline lens
swells, its index of refraction changes, and it becomes less uniform. All of
these contribute to the "myopic shift" that many people experience, usually
after age 60 or so.
-MT
This certainly happened to me. The nonuniformity showed up by my seeing |
multiple images. I called it a fly's eye phenomenon because I had no better
term to use for it.
I still had remanents of this fly's eye image after implantation of a lens
during cataract surgery. I still would like to have an explanation on why
the multiple images were formed by the impland and why they went away with
porperly fitted glasses.
Bill |
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Mike Tyner
medicine forum Guru
Joined: 24 Mar 2005
Posts: 1299
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| Posted: Tue May 17, 2005 8:40 pm Post subject:
Re: Presbyopia reversing on its own?
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"Repeating Rifle" <salmonegg@sbcglobal.net> wrote
| Quote: | I still had remanents of this fly's eye image after implantation of a lens
during cataract surgery. I still would like to have an explanation on why
the multiple images were formed by the impland and why they went away with
porperly fitted glasses.
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I still think it's corneal irregularities forming multiple images, and a
sphere-cylinder lens simply approximates them better, into a single image.
It's hard to imagine any other explanation.
-MT |
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William Stacy
medicine forum Guru
Joined: 01 May 2005
Posts: 1177
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| Posted: Tue May 17, 2005 11:01 pm Post subject:
Re: Presbyopia reversing on its own?
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Repeating Rifle wrote:
| Quote: |
This certainly happened to me. The nonuniformity showed up by my seeing
multiple images. I called it a fly's eye phenomenon because I had no better
term to use for it.
I still had remanents of this fly's eye image after implantation of a lens
during cataract surgery. I still would like to have an explanation on why
the multiple images were formed by the impland and why they went away with
porperly fitted glasses.
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Actually called polyopia or polyopsia, multiple images seen by one eye.
I had very symmetrical triplopia (3 images) of things like head
lights and streetlights when I was developing cataracts. They were kind
of annoying but also kind of picturesque. Made a christmas tree 3 times
more spectacular. I'm quite sure that mine were caused by disruption of
the old lens nucleus along the embryonic suture lines because of the
triangular symmetry of the images. Larger single disk lights looked like
3 petaled flowers and tiny lights at a great distance looked like little
3 bladed propellers. Mine were completely eliminated by the surgery, so
could not have been corneal. Since yours persist (have you had surgery
in BOTH eyes? If only one, you could be getting if from the unoperated
eye), I have to assume you had some corneal damage. Hopefuly it will
eventually heal.
w.stacy, o.d. |
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Repeating Rifle
medicine forum Guru Wannabe
Joined: 04 May 2005
Posts: 141
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| Posted: Wed May 18, 2005 3:45 am Post subject:
Re: Presbyopia reversing on its own?
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in article Epuie.3148$M36.1441@newsread1.news.atl.earthlink.net, Mike Tyner
at mtyner@mindspring.com wrote on 5/17/05 3:40 PM:
| Quote: |
"Repeating Rifle" <salmonegg@sbcglobal.net> wrote
I still had remanents of this fly's eye image after implantation of a lens
during cataract surgery. I still would like to have an explanation on why
the multiple images were formed by the impland and why they went away with
porperly fitted glasses.
I still think it's corneal irregularities forming multiple images, and a
sphere-cylinder lens simply approximates them better, into a single image.
It's hard to imagine any other explanation.
-MT
I am beginning to believe this explanation. Before my cataract surgery the |
images formed a scatter pattern such as might be produced by a shotgun. I
just now took my glasses off in a darkened room and looked at an LED on my
telephone from a distance of about 3 or 4 meters. I saw multiple images now
strung out in an almost horizontal line. I was able to reduce the number
images by stopping my pupil with a finger. Putting on my glasses merged the
images.
As a further check, I took my glasses off and looked a a rectangular window
on my computer monitor through the glasses. The window remained rectangular
when the glasses were in there normal orientation. As I rotated the glasses
along the line of sight, the window began to look trapazoidal as the
rotation angle deviated clockwise or counterclockwise. This is just what I
would expect if my cylindrical axis were close to vertical or horizontal.
Bill |
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William Stacy
medicine forum Guru
Joined: 01 May 2005
Posts: 1177
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| Posted: Wed May 18, 2005 1:48 pm Post subject:
Re: Presbyopia reversing on its own?
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Repeating Rifle wrote:
I
| Quote: | just now took my glasses off in a darkened room and looked at an LED on my
telephone from a distance of about 3 or 4 meters. I saw multiple images now
strung out in an almost horizontal line. I was able to reduce the number
images by stopping my pupil with a finger. Putting on my glasses merged the
images.
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When you say "merged the images" do you mean it eliminated all the extra
images? If so, then it is without a doubt your astigmatism. If not, I
mean if they are closer together, overlapping, whatever but still
multiple, then it is multiple refractions, true polyopsia and is due to
damage to the optics, either corneal, lenticular or both.
| Quote: |
As a further check, I took my glasses off and looked a a rectangular window
on my computer monitor through the glasses. The window remained rectangular
when the glasses were in there normal orientation. As I rotated the glasses
along the line of sight, the window began to look trapazoidal as the
rotation angle deviated clockwise or counterclockwise. This is just what I
would expect if my cylindrical axis were close to vertical or horizontal.
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This is normal observation through cylindrical (astigmatic) lenses of
any axis, not just 90 and 180.
w.stacy, o.d. |
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Repeating Rifle
medicine forum Guru Wannabe
Joined: 04 May 2005
Posts: 141
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| Posted: Wed May 18, 2005 5:27 pm Post subject:
Re: Presbyopia reversing on its own?
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in article 2tJie.18545$J12.17590@newssvr14.news.prodigy.com, William Stacy
at wstacy@obase.net wrote on 5/18/05 8:48 AM:
| Quote: | I
just now took my glasses off in a darkened room and looked at an LED on my
telephone from a distance of about 3 or 4 meters. I saw multiple images now
strung out in an almost horizontal line. I was able to reduce the number
images by stopping my pupil with a finger. Putting on my glasses merged the
images.
When you say "merged the images" do you mean it eliminated all the extra
images? If so, then it is without a doubt your astigmatism. If not, I
mean if they are closer together, overlapping, whatever but still
multiple, then it is multiple refractions, true polyopsia and is due to
damage to the optics, either corneal, lenticular or both.
|
There were more than two images without my glasses. It was almost a smear of
discrete and continuous images. My glasses merged all these images so that I
could not distinguish the merged images from a single image.
| Quote: |
As a further check, I took my glasses off and looked a a rectangular window
on my computer monitor through the glasses. The window remained rectangular
when the glasses were in there normal orientation. As I rotated the glasses
along the line of sight, the window began to look trapazoidal as the
rotation angle deviated clockwise or counterclockwise. This is just what I
would expect if my cylindrical axis were close to vertical or horizontal.
This is normal observation through cylindrical (astigmatic) lenses of
any axis, not just 90 and 180.
|
Without my glasses, the image on the monitor appeared to be rectangular.
Putting on the glasses change the clarity of the window but not its shape.
From that, I conclude that the cylinder was lined up vertially or crossed.
That is, oriented at O€ or 90€.
Bill |
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Mike Tyner
medicine forum Guru
Joined: 24 Mar 2005
Posts: 1299
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| Posted: Wed May 18, 2005 8:23 pm Post subject:
Re: Presbyopia reversing on its own?
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"Repeating Rifle" <salmonegg@sbcglobal.net> wrote
| Quote: | Without my glasses, the image on the monitor appeared to be rectangular.
Putting on the glasses change the clarity of the window but not its shape.
From that, I conclude that the cylinder was lined up vertially or crossed.
That is, oriented at O? or 90?.
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Probably so, or close. Oblique cylinder causes a noticeable tilt, but it's
proportional to the "cyl" number in your prescription.
If the cyl is -075 or less, it might be hard to detect the distortion at 90
or 180, but it'll be there. It's even harder to detect once you "get used to
it." Minus cylinder x 090 would make a square seem slightly smaller
horizontally, and x180 would make it slightly shorter vertically.
Of course the other meridian distorts too, unless your prescription is like
pl-075 or +075-075. Any meridian with focusing power will have a
proportional effect, enlarging if plus, minifying when minus.
-MT |
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William Stacy
medicine forum Guru
Joined: 01 May 2005
Posts: 1177
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| Posted: Thu May 19, 2005 2:32 am Post subject:
Re: Presbyopia reversing on its own?
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Repeating Rifle wrote:
| Quote: |
There were more than two images without my glasses. It was almost a smear of
discrete and continuous images. My glasses merged all these images so that I
could not distinguish the merged images from a single image.
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Does that mean the single image was clear, or was it blurred? If clear,
it was just regular astigmatism. If blurred, and the blur is not
correctible with spectacle lenses, it is irregular astigmatism or other
kinds of aberrations that are not ever correctible with glasses.
| Quote: | Without my glasses, the image on the monitor appeared to be rectangular.
Putting on the glasses change the clarity of the window but not its shape.
From that, I conclude that the cylinder was lined up vertially or crossed.
That is, oriented at O€ or 90€.
|
No, I'd conclude that the cylinder was lined up properly with your axis
of astigmatism, whatever that might be. While it's true that oblique
astigmatism corrections can distort shape slightly, especially when
first introduced, it is minimal and unnoticed by most people, and
oblique astigmatism is certainly not the same thing as irregular
astigmatism. But then I think we're off on a tangent here...
w.stacy, o.d. |
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