Dear Prevention-minded freinds,
There are two opinions about the prevention of myopia:
The second-opinion, that on the threshold, if you could prevent
incipient myopia before a minus lens is applied, you could

Is it true that when calculating the error of an eye, it is ok to say
that an astigmatism of -0.75 + myopia of -0.25 would be equivalent to
an astigmatism of -1.00? If not, which option (-075 + -0.25 or
-1.00)would be considered as "better vision" of the two?

I'm new to glasses, having used reading glasses for the past 10 years
or so.  I got a pair of progressives today and whereas they seem ok at
distance and mid range, reading a book, it seems that my field of sharp
vision is about 4 words across. If I were in the middle of the line,

I just had an eye exam (first in eight years). When I got home
I looked at the prescription and it had "Pl" under Sphere for
one eye. That same eye was -0.75 eight years ago.
Anyone know what the Pl notation means?

How do you recognize that glasses have anti-reflective coating?
I recently bought new glasses with AR coating, but I constantly see
reflection of my eyes and there is no green color that I had in
previous glasses.

Can vision be safely corrected better than 20/20? I'm guessing there
must be tradeoffs of correcting vision with glasses, contacts, or laser
beyond 20/20.

Just want some of your opinons. I do have glasses for
short-sightedness. But I only use it when looking at whiteboard or
during conference where the presentations slides are far. Problem is I
face computer everyday and since I can see things that are near to me

We've bought glasses from Lenscrafters for over 25 years now, and
they've always been very sharp and durable, lasting 4-8 years before
replacement, and even then, we just replace them because the
prescription changed.

Dear Prevention-minded friends,
Dr. Colgate asked me to post the following
regarding plus-prevention -- on how to avoid
entry into progressive myopia -- as

I'm about -6.00D, and it's time for new glasses.  My current brand
of progressive lens is Essilor Natural.  Is there any significant
difference among the various brands?  Is there one in particular
that seems to work better than the others?

I waitress two nights a week, and have a real hard time seeing the menu
when a customer points at a partcular item he wants to order. I wear
strong bifocals and can see ok at a distance and if things are close
enough to read normally, but my manager has noticed how hard a time I

Not sure if this has been done to death but what the hell. I'm
wondering can a 0.25 diopter difference in cylinder have the
effect I'm seeing. After all I get the impression that that's
"equivalent" to 0.125 or so in sphere.

My question is about a plot of the Contrast Sensitivity Function I
found on http://www.webvision.med.utah.edu/imageswv/KallSpat24.jpg. I
read the corresponding article on
http://www.webvision.med.utah.edu/KallSpatial.html over and over again

Why is it that my mother with her +3 prescription for distance can see better
without her glasses than I can without my -2.75?  She also has some stronger
glasses for reading.

Mike,
Please understand the following.
1.  I support the Wildsoet dynamic-eye paradigm, versus the
forzen eye pardigm of Doners-Helmholtz.