Hello Mac.
Let's see what we can do.
OD: sphere -.25, cylinder -6.25, axis 093
WOW! You've got some bad astigmatism, there.
The thread to which you linked discussed positive and negative values for
the cylinder. The cylinder can be changed to positive, and rotated by 90
degrees to have the same effect.
But you have a sphere correction, too...albeit a minimal one. That means
that we have to do a little massaging.
Here is the example that OnlineIDoc gave. These two prescriptions are
equivalent. According to him, you add the sph and cyl (basic math), change
the sign on the cylinder, and change the axis by 90 degrees.
+3.25 -.50 X 100 and +2.75 +.50 x 10 are equivalent.
(+3.25) + (-0.50) = (+2.75), which is exactly what the first value is.
Change the sign of the cyl, so -0.50 turns into +0.50, and the axis of 100
becomes (100 - 90) = 10.
On yours, you would do the same thing.
OD: sphere -.25, cylinder -6.25, axis 093
(-0.25) + (-6.25) = (-6.50)
Change the sign on the cyl.
Change your axis by 90 degrees.
So your prescription would be -6.50 x +6.25 x 003
It's doubtful that this conversion would help with your dilemma, though,
since it's an even bigger correction.
Isn't math fun? There are a whole lot of ways to get to the same answers...
-- Chuck Knight
On Wed, Oct 20, 2010 at 6:56 PM, Mac <[email protected]> wrote:
> Hello all. As I see you get a lot of posts with people asking for Rx
> translations. Hope this isn't one too many.
>
> Ive visited the various sites but none seem to offer my Rx, at least
> in it's current form, so I think it needs to be converted. I read this
> post (http://groups.google.com/group/glassyeyes/browse_thread/thread/
> 2adffaf410c6f9d7/2d267c6557a1300c?hl=en&lnk=gst&q=negative+90#<http://groups.google.com/group/glassyeyes/browse_thread/thread/%0A2adffaf410c6f9d7/2d267c6557a1300c?hl=en&lnk=gst&q=negative+90#>)
> but
> it's Greek to me so I hope there is an easier way.
>
> My Rx is:
>
> OD: sphere -.25, cylinder -6.25, axis 093
> OS: sphere -.50, cylinder -4.50, axis 092
>
> It's the cylinder I'm having problems with as the sites seem to offer
> -6 max.
>
> Any help converting this into a form that the sites recognize would be
> greatly appreciated.
>
> Thanks in advance.
>
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