You've implied below that these are the original lenses. That's a long time
between Rx changes. In general, if your Add power is less than +2.00, there will
be a larger than normal change in Rx. You'll find the glasses will have to do
more of the focusing, restricting the near vertical and horizontal field of
vision, resulting in a period of adaptation that may be moderate to significant.

Even if the Add power is already in the +2.25 to +2.50 range, changes in the
distance Rx (less plus or more minus) can play havoc with the intermediate
vision (22" to 40").    

I would recommend changing the lenses more often, unless the RX is stable.

Good job. Proper care and some luck goes a long way.

Ask about computer glasses if you're in front of a desktop monitor for extended
periods of time.

You might benefit from lens designs that use direct-to-surface free-form
technology (the lens surface, not the mold), especially if the Add or distance
Rx is strong, changes in Rx that are moderate to large, the lenses rest
unusually close or far from the eyes, or if you are sensitive to visual changes
in general. Some of the best are made by Hoya and Zeiss.

Anti-reflective coated lenses provide the best vision. The cosmetic improvement
is a bonus.  

Hope this helps,
 

Robert Martellaro
~~~~~~~~~~~~~~~~~~
Optician/Owner
Roberts Optical
Wauwatosa Wi.
~~~~~~~~~~~~~~~~~~
"Science is a way of trying not to fool yourself."
- Richard Feynman

Probably the Hoya Id, with their Super I-Vision AR Coat. But it would be
best to post your exact Rx (old and new) before acting on any advise.

OK, how about this? Panamic lenses with Crizal Alize in CR39.

You are happy with the lenses and have worn them for several years
with no issue. Why change? If you have any problem with your lenses
then you should look at an upgrade, this is why they are designed - to
counter people with issues, not those who are happy.

I was sitting in a conference one day when a friend next to me handed
me his glasses and said "Look at these." I did, and other than the
letters PA and UL under the location marks, I could see nothing
unusual. "Ipseo's?" I said. "Yep" he replied. I asked how he found
them? "There alright" he said rather unemphatically. I was rather
disappointed having spent $3000.00 on the measuring machine a few
weeks earlier. "Don't they have a wider reading field than other
lenses?" I asked. "Oh yeah, twice as wide as anything I have ever
worn, but I am happy in any multifocal."

The point is with the same design, you will be able to swap between
pairs without adaptation issues. There are also some issues with the
aberration filter as this is the average for your prescription, but
not everyone is average. I get a percentage of people not able to see
clearly with Physio 360's, but have great vision when replaced with
Panamic's. If you do opt for the Physio 360 abd there is any issue, at
least the warranty will enable you to switch back to the Panamic.

As far as material, stick with CR39. It is optically the best
material, and other than needing the glasses for industrial purposes,
where Polycarbonate, Trivex and 1.67 are the materials of choice, your
prescription will not be thinner or lighter going for the more
expensive material. Spend that money on a better frame or a new shirt.

Good luck.

dr grant