Thank you all for this enlightening discussion. I will probably encounter this issue in the future. Now I use trifocal glasses which has served me well. Thanks again!

OC Carlisle
Scientific Illustration, Photographic Fine Art
Guild of Natural Science Illustrators
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“Take Flight And Soar With Your Dreams”

On Aug 11, 2016, at 9:05 AM, Bruce Bartrug <[log in to unmask]> wrote:

Very interesting, Chris and Jim, and thank you both.

Reading through the articles about multifocal lens replacements reminds me of my experience with "progressive" (multifocal) lenses for standard eyeglasses.  In my day job as a pharmacist I needed the multifocal lenses and wore them constantly, including while driving.  When I began to have problems seeing clearly in my right eye and the cataract was noticed, I needed to change the right lens prescription.  Since I would probably soon need to change the right lens again (after cataract surgery), I opted to chang the right lens in a standard pair of bifocal glasses that I wear when using a camera or binoculars.  Since they are now the glasses I use for driving, I've discovered these are better for that activity than progressives....mainly because the peripheral vision is as clear as that directly in front of me....with progressive lenses one must look directly at a person/book/whatever as the progressive part of the lens is hourglass shaped.  As I became accustomed to using the bifocals I've noticed the accommodation difficulties at various distances is not the problem I had expected, and only becomes noticeable at some middle distances from about 3 feet up to about reading distance.  

This, and the warnings about contrast, etc., in the articles cited by Chris, confirms my notion that single focal length lens replacements of some near distance will most likely be my choice.  Since my forties I've always had three pairs of glasses.....a progressive pair for work and driving, a single focal length pair for reading, and another single focal length pair for computer work.  This occasionally led to extensive searches through the house :), but that was a small issue compared to having the ability to move my eyes when reading or using a computer, instead of constantly turning my neck when using progressive lenses (to keep the hourglass aimed at what I was doing/reading.) 

This coincides with photographic lenses......single focal length (or prime) lenses have always had the advantage when edge to edge sharpness and high contrast were needed.  Zooms (multifocal lenses) could come close, but were mainly for convenience.  This has changed in recent years, so multifocal, or other, lens replacements shouldn't automatically be rejected.  I probably will choose single focal distance replacements, but what I'm really going to miss is the ability to see the finest detail simply be removing my glasses and using my near-sighted eyes which focus at about 5 inches.

I'll let you know what I learn, Linny and Brie.

Interesting discussion, and thanks to everyone,


On Thu, Aug 11, 2016 at 1:33 AM, James A. Perkins <[log in to unmask]> wrote:

I just remembered that you also asked about the added cost of the different kind of lenses. I forgot to address that in my previous post.


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