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Speaking of Vision -- How 'bout Progressive Bifocals?



 
 
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  #1  
Old June 5th 06, 07:47 PM posted to rec.aviation.piloting
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Default Speaking of Vision -- How 'bout Progressive Bifocals?

Periphial vision is still fuzzy - I have to turn my head way farther to
the right or left and adjust the elevation of my head to make out
detail to the side.


Thanks, Randy -- but this doesn't make sense to me. The "progressive"
part of the reading lens starts below the half-way point down the lens
-- so why would they have ANY effect on peripheral vision?

Well, unless you're looking down, I suppose?
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"

  #2  
Old June 5th 06, 10:47 PM posted to rec.aviation.piloting
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Default Speaking of Vision -- How 'bout Progressive Bifocals?

Jay Honeck wrote:

Periphial vision is still fuzzy - I have to turn my head way farther to
the right or left and adjust the elevation of my head to make out
detail to the side.



Thanks, Randy -- but this doesn't make sense to me. The "progressive"
part of the reading lens starts below the half-way point down the lens
-- so why would they have ANY effect on peripheral vision?

Well, unless you're looking down, I suppose?


Jay, I'm not Randy, but I'll reply as I have progressive lenses. Mine
don't have the prescription in the bottom uniformly across the bottom as
with more conventional bifocals. The different presecription is more of
a circular shape and things read through the lower half of the lens are
only clear if nearly centered in the lens. The prescription on the elft
and right sides of the lower halves of my lens is about the same as the
prescription on the top half of the lens. So, my peripheral vision,
whether looking through the top half or the bottom half, is through my
distance prescription.


Matt
  #3  
Old June 6th 06, 08:29 PM posted to rec.aviation.piloting
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Default Speaking of Vision -- How 'bout Progressive Bifocals?


Jay,

Poked around and found these links - seemed to have some good
explaination....


http://www.allaboutvision.com/over40/progressive.htm

http://www.eyeglasses.com/progressive_lenses.page
(Scroll down aways. Gets into how to read a prescription, too.)

http://www.optiboard.com/forums/arch....php/f-51.html
(way more info than you or I need, but skimming though some of the
posts, I learned there are many different types of progressive lenses
and they all have their pros and cons. (high-wing vs. low-wing/ side
stick vs. yoke kind of thing...)

FWIW

Randy

  #4  
Old June 7th 06, 04:46 PM posted to rec.aviation.piloting
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Default Speaking of Vision -- How 'bout Progressive Bifocals?

Great stuff, Randy -- thanks.

I guess I don't understand this part:
************************************************** *******************************
Progressive lens design
In order to create a no-line progressive lens, there are two large areas of
the lens that you cannot see through. Imagine what an hourglass looks like.
This is the shape of the area of the progressive lens that you can see
through. Objects seen through the areas of the lens to the left and right of
the narrow middle section are highly distorted and you cannot see through
them.

************************************************** *******************************

Why would the areas to the left and right of the middle section be "highly
distorted"? Why aren't those areas simply made to your "distance"
prescription?

Any eye doctors here?
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"


  #5  
Old June 7th 06, 05:31 PM posted to rec.aviation.piloting
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Default Speaking of Vision -- How 'bout Progressive Bifocals?

Jay Honeck wrote:
Great stuff, Randy -- thanks.

I guess I don't understand this part:
************************************************* ********************************
Progressive lens design
In order to create a no-line progressive lens, there are two large areas of
the lens that you cannot see through. Imagine what an hourglass looks like.
This is the shape of the area of the progressive lens that you can see
through. Objects seen through the areas of the lens to the left and right of
the narrow middle section are highly distorted and you cannot see through
them.

************************************************* ********************************

Why would the areas to the left and right of the middle section be "highly
distorted"? Why aren't those areas simply made to your "distance"
prescription?


I don't fully understand the optics, but that's exactly what my
optician (who's a fellow pilot) explained to me, and when I got my
progressives, that's exactly what I experienced. I couldn't stand it,
and had him re-make the lenses as lined bifocals (which I'm still
struggling to get used to).
  #6  
Old June 7th 06, 11:06 PM posted to rec.aviation.piloting
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Default Speaking of Vision -- How 'bout Progressive Bifocals?

Roy Smith wrote:

Jay Honeck wrote:

Great stuff, Randy -- thanks.

I guess I don't understand this part:
************************************************ *********************************
Progressive lens design
In order to create a no-line progressive lens, there are two large areas of
the lens that you cannot see through. Imagine what an hourglass looks like.
This is the shape of the area of the progressive lens that you can see
through. Objects seen through the areas of the lens to the left and right of
the narrow middle section are highly distorted and you cannot see through
them.

************************************************ *********************************

Why would the areas to the left and right of the middle section be "highly
distorted"? Why aren't those areas simply made to your "distance"
prescription?



I don't fully understand the optics, but that's exactly what my
optician (who's a fellow pilot) explained to me, and when I got my
progressives, that's exactly what I experienced. I couldn't stand it,
and had him re-make the lenses as lined bifocals (which I'm still
struggling to get used to).


The above certainly does NOT describe my progressives.

Matt
  #7  
Old June 7th 06, 11:54 PM posted to rec.aviation.piloting
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Default Speaking of Vision -- How 'bout Progressive Bifocals?


"Matt Whiting" wrote in message
...
Roy Smith wrote:

Jay Honeck wrote:

Great stuff, Randy -- thanks.

I guess I don't understand this part:
*********************************************** **********************************
Progressive lens design
In order to create a no-line progressive lens, there are two large areas
of the lens that you cannot see through. Imagine what an hourglass looks
like. This is the shape of the area of the progressive lens that you can
see through. Objects seen through the areas of the lens to the left and
right of the narrow middle section are highly distorted and you cannot
see through them.

*********************************************** **********************************

Why would the areas to the left and right of the middle section be
"highly distorted"? Why aren't those areas simply made to your
"distance" prescription?



I don't fully understand the optics, but that's exactly what my
optician (who's a fellow pilot) explained to me, and when I got my
progressives, that's exactly what I experienced. I couldn't stand it,
and had him re-make the lenses as lined bifocals (which I'm still
struggling to get used to).


The above certainly does NOT describe my progressives.

Matt


It does not apply to the dozens of progressives I have had over the decades
either. Sounds like another OWT. Maybe they need to reconsider where they
purchase their eye wear.


  #8  
Old June 7th 06, 08:06 PM posted to rec.aviation.piloting
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Default Speaking of Vision -- How 'bout Progressive Bifocals?

Jay Honeck wrote:
Great stuff, Randy -- thanks.

I guess I don't understand this part:
************************************************** *******************************
Progressive lens design
In order to create a no-line progressive lens, there are two large areas of
the lens that you cannot see through. Imagine what an hourglass looks like.
This is the shape of the area of the progressive lens that you can see
through. Objects seen through the areas of the lens to the left and right of
the narrow middle section are highly distorted and you cannot see through
them.

************************************************** *******************************

Why would the areas to the left and right of the middle section be "highly
distorted"? Why aren't those areas simply made to your "distance"
prescription?

Any eye doctors here?

Jay, I have stayed out of this subject but thought that I would now add
some of my experience if you are still considering progressives. I
started with bifocals but after a few years tried progressives. I found
them to be better (for me) than the bifocals. About 8 months ago I got a
new prescription and had the lenses made at LensCrafters. They never
worked very well (the hour glass was too narrow and so peripheral vision
was very restricted). I had a new pair made, but this time I told them
to use Varilux lenses and not their in house brand (my initial
progressives were Varilux). I am now happy again with my new
progressives. There was a recent article (Aviation Consumer Volume 36,
Number 2, 2006) that discussed the differences between the lens
manufacturers of progressive lenses, and offered their opinion about
which lenses to get.

Cary
  #9  
Old June 8th 06, 02:17 PM posted to rec.aviation.piloting
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Default Speaking of Vision -- How 'bout Progressive Bifocals?

them to be better (for me) than the bifocals. About 8 months ago I got a
new prescription and had the lenses made at LensCrafters. They never
worked very well (the hour glass was too narrow and so peripheral vision
was very restricted). I had a new pair made, but this time I told them to
use Varilux lenses and not their in house brand (my initial progressives
were Varilux). I am now happy again with my new progressives.


Thanks, Cary. My family has used Lenscrafters for many years, but they DO
have a problem with quality control.

A couple of prescriptions back, they made a lens that had a "wave" in it
that drove me nuts. I eventually had them re-make it. My current glasses
came in earlier this week, but one of the lenses was scratched, so they are
re-making it. (They discovered this before I did, thankfully.)

Of course, given all the glasses they have made for us over the years (we
now ALL wear prescription glasses, with Mary "joining the fun" with her
reading glasses), that's a small -- but measurable -- number.
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"


  #10  
Old June 8th 06, 10:39 PM posted to rec.aviation.piloting
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Default Speaking of Vision -- How 'bout Progressive Bifocals?

Just thought I'd chime in with what I do... I am nearsighted,
astigmatic, and now presbyopic (the old man's eye problem

I have a single vision (distance) lens in my left eye (I fly from the
left seat) and a bifocal in the right eye, with the line 2 mm lower than
usual, to read my charts with. This has worked well for a few years,
but now I may need to move the line up so I can read my instrument
panel. The bifocal is just a +1 or so - whatever the least amount they
can put in is. I tried higher amounts but they don't work for me since
I don't like the different sized views I get from each lens (the bifocal
part gives a bigger image).

One optometrist would absolutely not fill my prescription - he didn't
think it was "a good idea". My wife also had a problem with some
glasses she bought (wavy distortions) and he absolutely would not
believe her, nor would he look through the lens himself. Alas, he died a
week later and we got everything straightened out.

Jose
--
The price of freedom is... well... freedom.
for Email, make the obvious change in the address.
 




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