Calculating Add for computer work

Discussion in 'Optometry Archives' started by Mike, Jan 25, 2008.

  1. Mike

    Mike Guest

    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?
    Mike, Jan 25, 2008
  2. Mike

    Mark A Guest

    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.
    Mark A, Jan 25, 2008
  3. Mike

    Ms.Brainy Guest

    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.
    Ms.Brainy, Jan 26, 2008
  4. Mike

    Mark A Guest

    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).
    Mark A, Jan 26, 2008
  5. Mike

    Mike Guest

    In message <>
    Thank you
    Mike, Jan 26, 2008
  6. Mike

    Dr Judy Guest

    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
    Dr Judy, Jan 26, 2008
  7. Mike

    Mark A Guest

    1. You need a license to carry a gun in Texas.

    2. Regarding having a open bottle of alcohol in your car, it has been more
    than 6 years that this has been illegal in Texas. Mississippi still allows
    drivers to consume alcohol while driving (as long as the driver stays below
    the 0.08% blood alcohol content limit for drunk driving), and seven states
    (Arkansas, Connecticut, Delaware, Mississippi, Missouri, Virginia, and West
    Virginia) allow passengers to consume alcohol while the vehicle is in
    motion. However, local laws in these states may limit open containers in
    vehicles, as was the case is some localities in Texas prior to 2001.

    3. The sale of liquor is controlled locally in Texas. More than 50 counties
    are completely "dry". In some areas of major cities (such as Dallas) there
    are no liquor stores allowed. Some localities in Texas even prohibit the
    sale of beer and wine in grocery and convenience stores.

    4. You may thing that Texas is the wild west, but I would bet you that there
    are a lot less car jackings there, perhaps because criminals understand that
    a driver "might" have a gun.

    5. Drivers are more polite in Texas than in most states, especially compared
    to northern states.

    6. You don't know Jack about Texas.
    Mark A, Jan 30, 2008
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