Re: Advice, vdu glasses from reading prescription
- From: Robert Martellaro <robopt@xxxxxxxxxx>
- Date: Tue, 30 Oct 2007 13:47:58 -0500
On Sun, 28 Oct 2007 16:10:13 +0000, Mr Edward <nospam@xxxxxxxxxxxx> wrote:
I'm hoping for some advice to help me order a pair of specs for computer
use from an online store. I've got a recent prescription for reading
glasses that are great for focusing at around 35cm, but not very suitable
for computer work:
R -0.25/0.50X160 L +0.50/0.50X180 Add Near +1.75
My script doesn't give a figure for 'inter', and as I want to make the
order as fool proof as possible, I was going to order reading specs and
adjust the 'add +1.75' to a lower power to make them suitable for use at
around 100cm distance.
Is there a rule of thumb I can apply to get the correct 'add' figure from
what I've already got?. Hope my question makes sense.
I'm 53 yrs, if it matters!
I wonder if computer glasses are really necessary. With an accommodative reserve
of +.75D (assuming the ADD is for 40cm), you should get reasonably good focus
with the glasses off when viewing objects at 100cm. However, if you're in front
of a monitor all day, more accuracy and refinement may be necessary, primarily
due to the disparity in the right and left eye Rx. In that case, I would have Rx
glasses made by an optician, with the Rx from a doctor, or an optician with
experience making specialty glasses.
Robert Martellaro
~~~~~~~~~~~~~~~~~~
Optician/Owner
Roberts Optical
Wauwatosa Wi.
~~~~~~~~~~~~~~~~~~
"Science is a way of trying not to fool yourself."
- Richard Feynman
.
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