Probably because there are too many distance glasses "variables".
Everyone reads at relatively the same distance. Magnify the letters in specific increments (1, 1.25, 1.5, etc.) and you'll satisfy the vast majority of readers. Reading glasses are just magnifiers. I can get by using my computer for short periods with off-the-shelf reading glasses, but I keep a pair of prescription glasses on my desk at work which were made just for using the computer. They compensate for the exact problem with my eyes as opposed to just magnifying the type. (I also have a special pair of bifocals for using a computer at 5 feet while also taking notes/reading)
Distance problems can be at 5 feet, 10 feet, 25 feet, etc. and caused by all sorts of different eyeball shapes and issues. You can't fix enough of any one problem with off-the-shelf distance glasses to make it cost effective.
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Distance problems are only caused by one thing: the spherical shape of the eyeball. If it is too protruding, one can see well close up but not at distance; too flat a shape and the reverse is true. To correct either, all that is needed is a lens that returns the eyeball to a spherical shape.
When we get older, most of us lose some of the ability of the eyes to adjust their shape to focus at closer distances; ergo, reading glasses.
Eyes can have other problems such as astigmatism but the effect of that is that objects in one plane are focused differentially from those at 90 degrees.
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This 'shape' of the eyeball explanation makes sense, since it is based upon a camera system, something everyone can relate to. Until,...I found out that people with multiple personality will test completely differently based upon which personality they are. One, is so myopic as to need 'coke-bottle' glasses, almost legally blind, Another, has perfect 20/20 and so on. Kind of 'redefines' vision. Or, maybe they force change the shape of their eye balls.
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All you need is a negative meniscus lens of whatever power you need. A negative meniscus lens is one that is thicker at the edges than in the middle; "reading" lenses are positive meniscus lenses, thicker in the middle than at the edges. The difference between the thick and thin part determines the diopter (power).
Simple meniscus lenses in a huge variety of sizes and diopters are readily available; Edmund Scientific being one source.
Go buy two and glue them into a frame. Or buy one and learn to use it as a monocle :)
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wrote:

I don't buy my reading glasses at the drugstore. Too expensive. I buy them at the dollar store.
And I did buy bi-focals once, since they were only a dollar. I didnt' really like them. Had to lower my eyes too much to use the strong part. Felt weird or even painful. There might have been more than one pair for sale, but I havent' seen them except that one time, maybe 4 years ago. If you mean with a hidden border between the different sections, or some sort of continuous change from weak to strong, I thin it's because no one makes them, because there isn't enough market for expensive cheap lenses. Even at the supermarket or drugstore, that's what they'd be.
Of course at the dollar store they're pretty cheaply made, and except for the style I bought a long time ago, all the plastic frames are pretty much guaranteed to break after a few months, I think because they are meant for women and my head is wider than a woman's.
I don't like the metal frames because those plastic feet that rest on the nose catch on my hair when I lift the glasses, unless I just had a haircut. But they don't break anywhere near as much, unless I sit on them, and the arms can be bent to make them tighter when the hinges weaken.
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http://www.zennioptical.com/ Please visit this web site. I've got no interest, other than being a satisfied customer. Last time I checked, they had eye glasses starting about eight bucks a pair (which includes single focus lenses to your Rx). More for bifocals, tint, and some other options.
You need to know your Rx, and your PD (pupilary distance). Last time, shipping was \$15 or so, for any order size.
Glasses made in Hong Kong, and shipped to you from some where in California.
I bought several pair of reading glasses, distance glasses. Put spare eye glasses in the vehicle, and set of reading glasses in my church book bag.
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Christopher A. Young
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On 11/7/2013 3:31 PM, willshak wrote:

I've been getting my glasses online from Zenni optical made in China.
http://www.zennioptical.com/?option=com_fireboard
Last pair with bifocal, memory titanium frames, anti reflective coating and shipping was \$55. Same thing from local optician would be over \$350. Wife criticizes me for not spending locally but I tell her that I use the savings to buy local beer. Besides, looking at the local opticians glass case, it says, "Made in China."
What you want is a progressive bifocal lens. Besides prescription, all you need is to measure your pupillary distance. My eye doctor did mine but you can do it yourself.
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On Thu, 07 Nov 2013 18:50:45 -0500, Frank

There aren't many houses for sale in that n'hood that I like, and you're screwing things up. Cut it out.

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interesting. have you tried exercising your eyes?
My father-in-law used to wear 'coke bottle' glasses. then went on a trip of eye exercising. Focusing close/far, close/far for ten minutes a day for a year. He said he had terrible head-aches, but finally he never wore glasses again.
The Chinese govt,with their socialistic health service started getting hit with requirements for prescription glasses - due to the computer revolution for them. Simple math tells you that's a BIG hit in cost! almost at any percentage. So they went into providing eye exercises for people and voila! fewer glasses were required.
for me, when things get a bit blurry, it's into eye exercises and blurriness goes away.
Conclusion is to try it.
focus far, focus close, one eye at a time, you'd be surprised how much that strengthens your eyes.
For close work, I still need the 1.50 eyeglasses from the drugstore, but at least they've held for over 20 years now. Whereas my brother has gone through tri-focal glasses now.
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On Thu, 07 Nov 2013 16:56:43 -0700, RobertMacy

How old was he when he did that? How old is he now?

That's a reason not to do that. Don't want to end up like the Red Chinese.

In my case, I first needed glasses, 1.25, when I was 50 and the type was small and the light was bad. Now I need 1.25 when the type is not quite as small and the light is pretty good (but not if the sun is shining right in the window on what I'm reading.) and I'm 66.
If it gets worse maybe I'll try your exercises.
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[my understanding] in his 20's, deceased - died on a guerney in a hospital during a normal examination. Must have been too far away from medical care, eh?

LOL! yeah, we don't want to end up like them, "soon to be rulers of the world", right?
Especially, after listening to an interview with a young couple struggling to survive. They had just wrecked their truck which they used as part of their floral business. They were barely making ends meet and now this completely unexpected hardship. They said their insurance didn't cover completely and rates would definitely go up, didn't know where theyd get the money to replace the truck and may lose their business. More importantly, they were extremely worried about where they would get the money to keep their children in school! Thought I was listening to a U.S. midwest couple's lament, only to find out I had been listening to the woes of a young couple in China?!!! I thought, wow they ARE just like everyone else, and then wondered if the interview was some type of 'propaganda' to convince me they were like eveyrone else. Well if it was, it worked, I still hear the laments of the young couple's woes and firmly believe it to be true. On the flip side, I no longer trust ANY non-persoanl situation that leaves such crystal clear memories. Even some personal situations have become suspect. And, discount all such as attempts to manipulate my thinking.

That's right. Wait until it's too late. :)
My experience similar. I just use the eye exercises now to be able to keep using the 1.25's Have to admit that having poor vision is a bummer! Like being in a prison. Now I have relative whose optic nerves were attacked by those high powered antibiotics necessary to stomp on those high powered infections! Her vision was almost destroyed. She can now read ONE LETTER at a time! But it has to be about the size of your computer monitor. However, good news, her vision has now improved to where she can read a whole word at a time.
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On Fri, 08 Nov 2013 06:02:50 -0700, RobertMacy

Yes. Can you imagine how happy people were in the 1300's and after that when they first found out about glasses and got some.

I hope she continues to improve.

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On Friday, November 8, 2013 1:01:07 PM UTC-8, micky wrote:

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On Fri, 8 Nov 2013 22:48:38 -0800 (PST), Higgs Boson

You don't have to read to want to see well, or if you think you do, then that percentage times the percentage who could no longer see well is the fraction who were very happy. Can you imagine how happy they were!
Hey, I read the url and it says an average of 30 or 40%. That's plenty of people. And among some groups it was much higher.
Plus, I said "after". Now, or at least recently, there have been populations that didn't have access to glasses, but then gained access.
Maybe you weren't trying to contradict me. Usenet is so quarrelsome that people who reply to posts are trying to contradict maybe 80 or 90% of the time.

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85.3% of statistics are made up on the spot.
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On 11/9/2013 8:21 AM, DerbyDad03 wrote:

94.3% of all Usenet posts are flames, you big idiot. Everybody knows that, d'uh.
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Christopher A. Young
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I've tried exercises. They work. It also helps not to put on glasses at the start of the day.
Greg
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wrote:

AFAIK, there are no restrictions, just no market. The number of combinations needed doesn't make it practical.
You don't have to spend hundreds of dollars on a pair of prescription glasses. I've had very good luck with Zenni Optical. I buy a good pair of distance glasses from the optometrist (insurance covers most of the cost), then several pairs of glasses set up for computer work, sun glasses, etc. from Zenni.
www.zennioptical.com
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Because they wouldn't be cheap. If they are not cheap, they won't get sold in bulk like they are at the drugstores.
I once had a pair of reading glasses that was sort of a bifocal - 1.00 reading glass on the bottom, clear glass on the top. I could wear them all day while working on projects. Now that I need way above 1.00, walking around with reading glasses on, especially on stairs, is dangerous. I am constantly putting them on and taking them off. I wish I could find a pair in my numbers with upper clear, but I haven't been able to.
Last year I had a special pair of bifocals made. I spend a lot of time in meetings where I am 5 feet from a computer screen and also have to take notes. I don't usually need distance glasses, but I can't see a computer screen at five feet well enough to work on spreadsheets, etc. The eye doc had one of his assistants come into the exam room and hold an eye chart five feet in front of me. He then did the "better 1 or better 2” thing until he found the prescription that worked at 5 feet. He then went through the process for a reading glass prescription and made a pair of bifocals that I use just for the meetings.
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In article <

I found a good compromise was the glasses with magnets that join the frames together at the front (think the ME from CSI:NY if you are familiar). I break them apart and wrap them around my neck when I don't need them for awhile, yet I don't lose them like I tend to do with the others. Also, when I break them apart, it often confuses who I am talking to for a couple of minutes- grin)

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“Statistics are like bikinis. What they reveal is suggestive,
but what they conceal is vital.”
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