Re: New Rx

On Jul 28, 6:01 pm, p.clar...@xxxxxxxxx wrote:


The progressive portion of the lens will
therefore provide the proper lens power at all distances between
infinity and about 15 inches from your face depending upon how far
down in the lens you view the object (by holding it down or tilting
your head back). Determining the near add power is pretty simple for
progressives but more prone to error with lined bifocals since its
hard to know at what distance the patient does much of their near
work.

Are you saying that true progressives are really progressing gradually
and not just 3 zones with no lines?

Exactly. Absolutely. Progressives are known as PAL lenses or
Progressive addition lenses. you just look down in the lens, or tilt
your head back to the position where to power you need is located.

I have wondered about it and have
been told that the modern special computer glasses progress gradually,
whereas the "normal" distance progressives actually are tri-focals
with no lines.

Nope. They are all true progressives. The computer type progressive
styles have a wider channel (intermediate area between top and bottom)
so that a wider screen can be visualized clearly.http://optometry.osu.edu/COOR/4058.cfm

Bingo! This dissolves all my concerns.

I have never had any problems with progressives and felt comfortable,
smooth and natural with them from the first minute. But reading
messages on S.M.V. it seems that many people do have problems
adjusting to progressives. I tended to attribute it to my relatively
simple situation in the past (moderate myopia with mild astigmatism,
but otherwise healthy eyes), whereas many people have a variety of eye
problems.

Now my situation has changed. I have one IOL, a damaged retina, more
advanced presbyopia and a small cataract in the other eye. I can no
longer get 20/20 correction, and the new glasses I am going to order
will cost about 3 times more than I ever spent on eyeware. Hence my
concerns.

I still wonder why in illustrations of progressive lenses 3 distinct
colors are used to represent 3 zones, if in reality there are no
"zones" but rather a gradual progression of lens power. I think it's
the source of my mistaken concepts. And I still wonder why not
everybody chooses progressives and why so many people encounter
problems with them.

.

Relevant Pages

  • Re: New Rx
    ... properly focused with the same lens power that provided clear vision ... read at this distance, at least through my good natural L eye. ... Lens power (in ... Are you saying that true progressives are really progressing gradually ...
    (sci.med.vision)
  • Re: Seeking re-assurance on my prescription
    ... recently seen an optometrist and been given this for distance: ... and this for reading: ... That's a +225 add in each eye, with a difference between the two eyes of ... The only thing that seems out of whack is they talked you into progressives ...
    (sci.med.vision)
  • Re: Seeking re-assurance on my prescription
    ... recently seen an optometrist and been given this for distance: ... and this for reading: ... That's a +225 add in each eye, with a difference between the two eyes of ... The only thing that seems out of whack is they talked you into progressives ...
    (sci.med.vision)
  • Re: glasses problems
    ... architects I have worked with used a special pair of glasses for medium ... glasses on but could see around the room (distance of 25' plus reading ... My distance vision with corrective lenses is wonderful. ... When I say progressives were bad, ...
    (rec.guns)
  • Re: Vision Correction and Golf (longish)
    ... distortion at the edges of the lenses than with progressives. ... the same place with glasses as without glasses. ... dominant eye is my right). ... Second one fat. ...
    (rec.sport.golf)