Calculating Add for computer work

I made it clear to my optometrist that I would probably get less strain
if I wore glasses for computer work. So he gave me what now turns out
to be a reading prescription. It didn't dawn on me at the time when he
said "hold this book in front of you while I put this in front of your
lens", that they would be no good for computer work (unless I get much
closer to the screen)

My Add is +1.00 so is there a rule for working this out for computer
work with a screen that's about 70cm away?

 

For some computer lenses like the Zeiss Gradal RD, you just give them your
regular progressive Rx, and they automatically adjust it for computer use.
This is typically done by adding +.5 to your distance vision and subtracting
..5 from the add power (so that the reading power is actually the same as it
would have been with regular progressives). This makes your distance power
about the right power for computer distance (you don't get a true distance
power and you cannot drive a car with these lenses).

The .5 is just an example (don't recall what Zeiss uses), and sometimes you
can choose between different adjustments (such as .5 and .75 ). See an
optician for details.

 

So do I. My Zeiss computer glasses are more comfortable than my other
pair that's supposed to provided me the needed 20/20 for driving.

 

Probably because your eyes have gotten a bit weaker, and you really need a
new Rx with additional power in the distance area (which the computer
glasses give you).

If you look at Zeiss informational material (or any other vendor who sells
computer glasses) they are quite clear (no pun intended) that computer
glasses are not for driving (because the lens does not contain a viewing
area with your distance Rx).

 

In message <>

Thank you

 

For most people an add of +1.00, if over the distance Rx should be
clear at 70cm, clear out to 1M. Return to your optometrist with the
distance to your computer in hand and have him work out the add in
space with hand held lenses. You obviously have eyes that don't react
in the usual way.

Dr Judy

 

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