Re: Advice, vdu glasses from reading prescription


"Mr Edward" <nospam@xxxxxxxxxxxx> wrote

OK Ive measured the range of clear focus and it's 44cm to 65cm when
viewing
my LCD screen, and curiously different at 34cm to 74cm when viewing the
printed page. Is that normal?

It is what it is. It's noteworthy that the midpoint of both measurements is
about 54 cm.

Well, nominally if you want clear vision at 100 cm, you'd want a 1.00
diopter add.

Those glasses wouldn't be so hot for printed work, making it difficult to
see your bank statement while reconciling checks on the screen.

Since you're talking about online prices, I'd recommend a progressive to
cover a more useful range:

R +0.50-0.50x160
L +1.25-0.25x180
add +1.00

The "tops" would be clear out to 133 cm (+075 effective add), and the bottom
clear up to about 40 cm (+1.75 add). The cheapest progressives work pretty
well with low add powers like +1.00.

-MT, OD


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