Mine have 3 distances. Close, medium & distance. I have no idea,what they cost as i got them through insurance at work. I have had them for years. Only issue i have ever had is driving a,lawn tractor & look back to side to check mowing swath. I do know people who have trouble with them but until this thread never thought about them i have corneal disease in my right eye so i get MD level eye care.
Dwight Giles Jr. Wickford RI On Wed, Jun 3, 2020, 8:13 PM Craig via Mercedes <mercedes@okiebenz.com> wrote: > On Wed, 3 Jun 2020 15:53:48 -0500 Kaleb Striplin via Mercedes > <mercedes@okiebenz.com> wrote: > > > From what the doctor told me, progressives is just another name for no > > like bifocals. > > "No like", huh? Does that really describe your feelings toward them? :-) > > > I was looking briefly on the Internet for a picture showing the > distribution of focal lengths across the typical "progressive" lens > which I had seen before, but I couldn't find it. > > I had thought the focal length was continuously variable from the > top-middle of the lens to the bottom, but such is not the case. There are > typically three central "zones" with progressively shorter focal lengths > as one goes from the middle-top to the bottom of the lens. There are also > two "zones" to the sides of the central "zones" which have a different > focal length for peripheral vision. > > > Craig > > _______________________________________ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > _______________________________________ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
