| privacy_101@hotmail.com 2006-06-23, 9:24 pm |
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Dr. Leukoma wrote:
> Given all the information, -1.75 seems way too much power.
This is a prescription i got mabye 10 years ago, I'm now 41.
I doubt you
> would be comfortable driving w/o correction if indeed that was your
> true prescription.
well, all the Optometrists have given me a much lower 'power figure'
(?), and Im told this is something to do with ageing. Also there was no
astigmatism before.
Because of this, your eyes have a tendency to
> "prefer" more minus. Going from -1.75 to plano
I dont know that 'plano' means.
would seem rather
> extreme, and you would probably "reject" that prescription. The other
> prescriptions do not seem "significantly different" from each other.
Yes, and what im after is someones opinion as to whether i should go
0.25, or 0.50. Also whether prescription B is the best / average. I've
been put in a position where I have to make a decision about what
Prescription to go for, whilst know close to nothing about Optometry.
> There is built-in error in every measurement, and the process of
> refraction is designed to truncate the error in favor of more plus
> rather than too much minus.
I'm not sure what you mean by this.. A power of -0.25 has 'more plus'
than -0.50; um, therefore is 0.25 the 'built in error in favour of more
plus? Therefore I should go for 0.50?
>
> Take it from there.
Thanks, I'm trying to 'take this' somewhere, but I'm still confused. I
was hoping some guru would just tell me whether to go for prescription
A B C, or D. 
B and D are the average Prescriptions, the only difference is the -0.25
or -0.50 power.
They are also the prescriptions where the Optometrist didnt know that i
used to wear -1.75..
Andy
ps, I thought Optometry would be less subjective.. During many of the
eye tests, I couldnt tell the difference, especially the astigmatism
tests (a bunch of dots on a hexagram (?)), I usually had to decide
whether I 'preferred' the bolder fuzzier dots, to the lighter/fainter
sharper ones. In hindsight, it was only in the last test that i was
also concentrating on the shape of the hexagram, and using that as a
factor as to which one I 'preferred'. when things are equally but
*different;y* distorted, its hard to select which one is 'better',
unless the patient is told what criteria to use for 'better'. At least
with the eye charts, you can either read the correct letter, or not.
The Optometrist D, when i later showed her the previous results and
asked her if 0.25 would be ok for power simply said that I read more
letters with 0.50. Does this settle the matter, or does it say more
about my subjective performance on the day.. im so confused..
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