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#1
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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
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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
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![]() 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
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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
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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
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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
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![]() "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
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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
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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
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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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