Are the lenses right? My doctor returns 30% of the lenses from the major
local lab that he is required by some insurance plans to use instead of his
own lab, where rejects are essentially zero.
It's not unusual to get lenses wrong. An don't even consider those glasses
in an hour places
Bill Pearce
----- Original Message -----
From: "Chuck Norcutt" <chucknorcutt@xxxxxxxxxxxxxxxx>
To: <olympus@xxxxxxxxxx>
Sent: Tuesday, November 04, 2008 7:13 PM
Subject: [OM] Re: Dealing with astigmatism through the viewfinder
> Wow! Almost too much data to digest. But hold on for this news flash.
> The new glasses are here, work better than the old ones but the left
> eye clearly doesn't see "sharp" like the right. Not sure why. Big
> mystery now that I know how to read the prescription. The new
> prescription says the left eye (view finder eye) doesn't have any
> astigmatism. The previous prescription did. What gives? Do the new
> glasses not work so well for the left eye because the prescription that
> says no astigmatism today is wrong or is it the slightly worsened (over
> last year) cataract in the left eye that is causing the problem. Dunno.
> Gotta go see the doc again I guess.
>
> Chuck Norcutt
>
> usher99@xxxxxxx wrote:
>>
>> Hmmm,
>>
>> Data I've seen that showed corneal thinning reversed within one month
>> of discontinuation, though this is outside my normal area. From what
>> I've seen there are restrictions on who can be corrected with these
>> specialized contacts for astig. I dislike using glasses with a VF too.
>> I've seen clear data that the multi focal radial contacts ( likely as
>> well in the radial design multifocal replacment lenses with cataract
>> surgery) reduce contrast and resolution though may still work very
>> nicely for some. Whether they can be made with astig correction as
>> well, I don't know.
>> Worth a look in any event.
>> Perhaps a custom diopter with one of the add on eyecups made by your
>> optometrist---would clearly need a 2nd version for vertical
>> orientation. Doesn't sound super convenient but possible. I am
>> surprised this issue has been so poorly addressed by the manufacturers.
>> Should be engineered so that the eyecup can be rotated or at least the
>> custom diopter could be rotated so that the astig. correction is
>> properly oriented.
>>
>> Live view focusing is another slower solution. excuse to get MKII?
>>
>> At least the replacement lenses with IOP cataract surgery are
>> progressing nicely. It appears the ones that hook up to the ciliary
>> apparatus may be a Leica solution for many. We'll see how the data
>> holds up.
>>
>> http://www.allaboutvision.com/conditions/iols.htm
>>
>>
>> http://www.crystalens.com/IsCrystalensRightForYou.aspx
>>
>> Mike
>> (who has a self-interest in keeping Dr. Focus in focus)
>>
>>
>> So my question is how do y'all recommend I do this? A separate
>> correction lens for the viewfinder? If so, how do I attach it and
>> account for the need for correct rotational positioning of a lens
>> designed for astigmatic correction? Or do I just use my distance vision
>> glasses and adjust the diopter dial on the camera as needed. I've also
>> just ordered my first ever set of bifocals. They've not arrived yet.
>> Any problems with using them looking through the viewfinder?
>>
>> Thanks,
>> Chuck Norcutt
>>
>>
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