Archived posting to the Leica Users Group, 2006/11/16
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Hey Richard-- In the monovision solution, does the brain do do a "blend" to get acceptable focus at various distances? Bifocals always frustrated me with their one close focal length. I could focus easily on my monitor or book, but not on a painiting hanging on the wall of a gallery. Bookstores and libraries were VERY frustrating. Progressive lenses answered that for me well. I appreciate all the experience and knowledge you folks are sharing. Ric On Nov 16, 2006, at 12:00 AM, Richard Clompus wrote: > Ric, > > As an optometrist, maybe I can shed a little light on this > subject. :-) When you're over 40, your eyes lose their close > focusing ability. Spectacle wearers often chose progressive (no- > line bifocals) lenses that provide distance, intermediate and near > focus for both eyes. There are both soft and hard bifocal contact > lenses. Soft bifocals contacts are the most common. They contain > multiple sets of optics that focus distance and near images > simultaneously on the retina. Some people adapt and can ignore the > near optics when viewing distance objects and can ignore the > distance optics when reading. For others, they simply report > blurred vision at distance and near. Some brains can handle this > and some can't. The most common contact lens technique used 75% of > the time is called monovision. You fit the dominant eye with a > distance contact lens and the non-dominant eye with a near contact > lens. It takes a few weeks to adapt but most people do very well. > It's not good for some sports where depth perception is very > important and also not good for intensive reading and near tasks. > For many who work and drive, its the ideal compromise. Until we > develop a focusing contact lens, monovision is the most common > solution. With a camera, you would see the viewfinder with the eye > wearing the distance lens. Monovision would not work if you have > amblyopia or a "lazy eye". > > I hope this helps. > > Best regards, > > Richard > > Richard Clompus, OD > Ponte Vedra Beach, FL > > > On Nov 15, 2006, at 6:57 PM, Ric Carter wrote: > >> Speaking of vision adjustment-- >> >> Anyone here have experience with contacts for reading glasses? I >> have a minor correction for long focus, but need reading glasses. >> An acquaintance has a reading contact in one eye and a distant >> contact in the other and swears it's great. >> >> Sounds flaky to me. >> >> I am, though, tired of squashing my glasses against my face to >> focus. I'm happy with my progressive lenses otherwise after >> finding bifocals drove me crazy in book stores and art museums. >> >> Ric Carter >> http://gallery.leica-users.org/f/Passing-Fancies >> >> >> >> >> On Nov 15, 2006, at 6:46 PM, Eduardo Albesi wrote: >> >>> You will not have that problem for sure: the M6 viewfinder ocular >>> has a rubber protection to avoid glasses damage >>> :-) >>> >>> Best, >>> >>> Ed >>> >>> El 15/11/2006, a las 20:32, Alastair Firkin escribi?: >>> >>>> I will not have that problem for a while, anything beyond arms >>>> length is perfect, so I'll be hanging them around the neck just >>>> above the M6 whipping them on to set up etc and then happily >>>> shooting "raw" again ;-) >>>> >>>> On 16/11/2006, at 10:04, Leonard Taupier wrote: >>>> >>>>> Alastair, >>>>> >>>>> I shot with a M2 and M3 at times. If you do you better put >>>>> something over the viewfinder to protect your glasses. It's >>>>> metal not rubber and can be pretty sharp. I think Stephen still >>>>> sells a little sticky donut for that purpose. What I do is >>>>> punch a hole in a band-aid and then with scissors cut around >>>>> the hole to fit the eyepiece. I'm still walking around with a >>>>> scratch over the right lens the first and only time I didn't >>>>> use protection. Just a word of advice. >>>>> >>>>> Len >>>>> >>>>> >>>>> On Nov 15, 2006, at 6:08 PM, Alastair Firkin wrote: >>>>> >>>>>> I have my first pair of glasses coming this afternoon: I can >>>>>> put up with not being able to read X-rays at work, but when I >>>>>> could not read the f- stop on my M6 something had to give ;-) >>>>>> Better than the alternative has always been my philosophy. >>>>>> >>>>>> Cheers >>>>>> On 16/11/2006, at 7:25, Tina Manley wrote: >>>>>> >>>>>>> LUG: >>>>>>> >>>>>>> Disregard this comment that I made about the M8: >>>>>>> >>>>>>> "Either the viewfinder is dimmer than my M7's or my eyes are >>>>>>> getting worse (a possibility!) It's harder to get the focus >>>>>>> right than with the M7." >>>>>>> >>>>>>> I just got back from having my eyes checked and the vision in >>>>>>> my left eye has decreased 20% since my last check-up! The >>>>>>> doctor checked for glaucoma, cataracts, macular degeneration >>>>>>> and all kinds of stuff and found nothing. I'm going back >>>>>>> next week another test and some new glasses. My focusing >>>>>>> with the M8 should improve immensely when I have glasses that >>>>>>> match my new decreased vision. Getting old sucks but it's >>>>>>> better than the alternative!! >>>>>>> >>>>>>> Tina >>>>>>> >>>>>>> Tina Manley, ASMP, NPPA >>>>>>> http://www.tinamanley.com >>>>>>> >>>>>>> _______________________________________________ >>>>>>> Leica Users Group. >>>>>>> See http://leica-users.org/mailman/listinfo/lug for more >>>>>>> information >>>>>> >>>>>> >>>>>> _______________________________________________ >>>>>> Leica Users Group. >>>>>> See http://leica-users.org/mailman/listinfo/lug for more >>>>>> information >>>>> >>>>> >>>>> _______________________________________________ >>>>> Leica Users Group. >>>>> See http://leica-users.org/mailman/listinfo/lug for more >>>>> information >>>> >>>> >>>> _______________________________________________ >>>> Leica Users Group. >>>> See http://leica-users.org/mailman/listinfo/lug for more >>>> information >>>> >>> >>> >>> >>> _______________________________________________ >>> Leica Users Group. >>> See http://leica-users.org/mailman/listinfo/lug for more information >> >> >> >> _______________________________________________ >> Leica Users Group. >> See http://leica-users.org/mailman/listinfo/lug for more information > > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information