Archived posting to the Leica Users Group, 2006/11/16

[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]

Subject: [Leica] Vision correction
From: ricc at mindspring.com (Ric Carter)
Date: Thu Nov 16 06:58:34 2006
References: <7.0.1.0.2.20061115152125.0256f670@infoave.net> <26169B14-55FF-4874-BE58-C867CAD89E9B@ncable.net.au> <5E5D4CCC-A40B-40F6-B545-B3F5BA05C5FF@comcast.net> <29CF0EE7-6BD7-4A07-9381-FAD476E3AC12@ncable.net.au> <A872C1C6-2981-4EEE-92C5-720D34BC20F6@ciudad.com.ar> <768933FC-4926-4BFC-8437-A1473BA07404@mindspring.com> <9D4EC4E3-EC52-4720-A6AC-FA25DA49B211@mac.com>

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



Replies: Reply from rclompus at mac.com (Richard Clompus) ([Leica] Vision correction)
In reply to: Message from images at InfoAve.Net (Tina Manley) ([Leica] M8 Impressions, Pro and Con, correction)
Message from firkin at ncable.net.au (Alastair Firkin) ([Leica] M8 Impressions, Pro and Con, correction)
Message from len-1 at comcast.net (Leonard Taupier) ([Leica] M8 Impressions, Pro and Con, correction)
Message from firkin at ncable.net.au (Alastair Firkin) ([Leica] M8 Impressions, Pro and Con, correction)
Message from eduardoalbesi at ciudad.com.ar (Eduardo Albesi) ([Leica] M8 Impressions, Pro and Con, correction)
Message from ricc at mindspring.com (Ric Carter) ([Leica] Vision correction)
Message from rclompus at mac.com (Richard Clompus) ([Leica] Vision correction)