[N0help4u]

I use to have really great vision. I could read the copyright on the eye chart.
My eyesight has gone down hill and I can't afford the eye doctors.
I wanted to know what my eyesight is now APPROXIMATE
Since it is obviously no longer 20/20

I wear 200+ reading glasses from the $ Tree. Can you tell roughly where my eyesight range would fall from that?

[ChihuahuaMomma]

Nope. You have to have an exam. I mean I don't have anything to work from. I can tell you that your add power (bifocal/reading glass) would be anywhere from +1.50 to +2.25. But from this I cannot tell what your distance vision would be, nor your astigmatism or the axis that that astigmatism would sit.

Please let me know if you have any other questions.

[JudyKayTee]

Nope. You have to have an exam. I mean I don't have anything to work from. I can tell you that your add power (bifocal/reading glass) would be anywhere from +1.50 to +2.25. But from this I cannot tell what your distance vision would be, nor your astigmatism or the axis that that astigmatism would sit.

Please let me know if you have any other questions.

Hi Momma - maybe you can tell me about this. The same Doctor who goofed up my contacts gave me some sort of explanation about different strengths of reading glasses depending on the distance between my eyes and whatever I was attempting to read.

I was somewhat puzzled but, okay. Any thoughts from the board expert?

[ChihuahuaMomma]

Hmm... that's odd. Could you elaborate on the distance between your eyes? Perhaps they were talking about PD (pupillary distance), this makes a huge difference as does astigmatism and distance correction when purchasing over the counter readers as opposed to prescription reading glasses.

[KISS]

It's not ODD at all. What your doing with reading glasses is changing the focal point of the eye. i.e. where the eye will find an object in focus.

As an example use reading and using a computer. Using a computer sitting and straight on most of the time will have a focal length smaller than reading a book.

What happens is if your using a pair of glasses not suitable to the work your doing, your eyes are doing work trying to focus. So, it's important to constantly change the focus of the eye. Look far, look near as much as you can. This will strengten the muscles.

I asked for a particular focal length and I got some very odd glasses made. I have a pair that when I look straight ahead, I'm looking through say a 12" focal length, but when I'm looking up, I am using my distance correction.
Usueful for someone using a laptop and watching TV or using a monitor and greeting people behind a counter. That prescription would drive you nuts for driving a car, for instance.

If I remember right when I was doing the math, you should be able, I think, to get an idea of what the correction should be if you know what distance your eye focuses without glasses.

As you age, you will start to get more farsighted, but I am a firm believer that it's best getting task oriented glasses if you can afford them.

[JudyKayTee]

Hmm...that's odd. Could you elaborate on the distance between your eyes? Perhaps they were talking about PD (pupillary distance), this makes a huge difference as does astigmatism and distance correction when purchasing over the counter readers as opposed to prescription reading glasses.

It was exactly what KISS said - interesting he can explain my questions and I cannot. He works as my translator. :)

And I need a translator.

Yes, it was something about reading with a book in my lap, reading with a book on the table, computer work, different glasses.

But, as I said, he also made a mistake (or whatever he did) with my contacts and by that time I really didn't care much what he was talking about.

[KISS]

Thanks for the complement. I found a website that touches on the ideas, but without detail:

http://-kickin.com/apps/opticalbasic...ens_basics.php

I went through the math from finding PD using my camera. Computing the focal length from the prescription. Learning about frame dimensions and type of lenses and the index of refraction from the materials.

I got 3 pairs of glasses. Two were standard bifocals, one glass, one Trivex.
Trivex is veru close to glass. You'll see the best using glass lenses, but they will be heavy. Trivex is next providing your prescription will allow them. Then I got my weird pair of bifocals in glass.

I got AR and UV on the glass. AR on the plastic because plastic inherently has UV protection. In the glass case the UV and AR were placed on different sides of the lens.

The AR or anti-reflection coating cuts back on the glare.

I was researching polarized night glasses, but you need good transmission and a yellow tint.

I have a yellow clip on lens for fog and clip ons for sun.

I didn't get to check out the Izon lenses. izon.com, but they really intrique me. It's like having Lasik results without the surgery. The required changes are in the lens.

I got 3 pairs of the same style and purchased the frames in various places because of cost. I like the sferoflex frames. They must be purchased from dealers and are hard to find online. I used a virtual site that you can "try on glasses".

Yes, I gave the optician some work to do.

Plastic lenses scratch too much for me.

[JudyKayTee]

[QUOTE=KeepItSimpleStupid]

Thanks for the complement. I found a website that touches on the ideas, but without detail:

http://-kickin.com/apps/opticalbasic...ens_basics.php

I went through the math from finding PD using my camera. Computing the focal length from the prescription. Learning about frame dimensions and type of lenses and the index of refraction from the materials.

I got 3 pairs of glasses. Two were standard bifocals, one glass, one Trivex.
Trivex is veru close to glass. You'll see the best using glass lenses, but they will be heavy. Trivex is next providing your prescription will allow them. Then I got my weird pair of bifocals in glass.

I now spend a great deal of time looking for my glasses. I've considered tying them around my neck with rope - or one of those chains, if worse comes to worse.

If I ever had multiple pairs - I can only imagine.

(Yesterday I was rummaging around, looking for them, and caught sight of myself in the mirror - they were pushed up into my hair.)

[Danni2222]

You engineers are a pain I must say but ill hand it to you 9times on of ten your spot on! The distance between your eyes and what your focusoing on is indeed important when establishing your near prescription as it alters the focal length.