Sola Access for near -> mid only?

Discussion in 'Optometry Archives' started by The Real Bev, Oct 6, 2003.

  1. The Real Bev

    The Real Bev Guest

    A friend (-6 with a 2.5 add for reading) is trying some Sola Access
    lenses which are for near- to -middle distance only. The doc explained
    that there is a maximum variation between the nearest and furthest
    settings of 1.5D. The friend's wife is nearsighted, but less so and
    with a less than 1.5D add. Friend wondered if she could get Access
    lenses that would work for both near and far. The doc said no. The
    friend (Caltech grad and instructor) asked if the reason was optical or
    biological. The doc said it was optical but couldn't explain it.

    Any explanation?

    "Steve Balmer, CEO of Microsoft[0], recently referred to LINUX as a
    cancer. Unsurprisingly, that's incorrect; LINUX was released on August
    25th, 1991 and is therefore a virgo." -- Kevin L
    The Real Bev, Oct 6, 2003
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  2. The Real Bev

    Mark A Guest

    Why would anyone want to do that instead of regular progressives?

    My guess is that the far vision would not be as good as a normal progressive
    and would not be as suitable for driving. This would probably be manifested
    in the poorer peripheral vision at far distances needed to achieve a wider
    transition area. But that is just a guess.
    Mark A, Oct 6, 2003
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  3. The Real Bev

    The Real Bev Guest

    Do what, have near+mid progressives? If you spend most of your time
    inside and/or using a computer and only use distance vision for driving,
    it makes perfect sense. The Access lenses provide a wider field of good
    focus than ordinary progressives, which is why his wife wants them.
    Would that make more sense to me if I'd actually used progressives?
    The Real Bev, Oct 6, 2003
  4. The Real Bev

    Dr Judy Guest

    Access lenses are not for far, they are for mid and near, your friend's wife
    will not see clearly at far with them. If she wants far and near, she needs
    a regular progressive or bifocal.

    With acccess type lenses while looking straight ahead, the computer will be
    clear. When looking down, near print ie books, papers, invoices will be
    clear. By tipping the chin down and directing eyes upwards, the bulletin
    board and faces of people coming in your door will be clear. The clock
    across the room and the view out the window will be blurred though, with no
    spot on the lens getting them clear.

    To understand this lens design, draw a circle on a piece of paper to
    represent the lens. Now draw a small arc cutting through the top of the
    circle like a smile, with the deepest part of the arc about 1/8 the diameter
    of the circle. Repeat with a similar arc (frowning this time), on the
    bottom. The large middle area of the circle will have the midrange power,
    about +1.50 add. The top arc area is the "far" portion, but will only be
    good out to about 6 to 8 ft, similar to +0.50 add. The bottom area is the
    "near" portion, similar to +2.00or +2.25 add. The difference between +0.50
    distance and +2.00 near gives the 1.50 variation.

    Your friend's wife could have the Access set so that the top was equivalent
    to her distance, the middle to +1.00 add and near to +1.50 add but I would
    be willing to bet large sums that she would not be happy with the quality of
    the distance vision. If her add is less than 1.50, she can likely use a
    computer with her distance glasses, setting it a little further out at say
    30 inches instead of 22, or see distance indoors (6 to 10 ft) with single
    vision readers; either of those options would be simpler, easier to use and
    less expensive than Access type lens.

    Dr Judy
    Dr Judy, Oct 7, 2003
  5. The Real Bev

    Dr Judy Guest

    The large field of good vision in the Access is set for mid range, not
    distance or near. The largest field of vision would be with single vision
    mid range glasses, and with your friend's wife having an add of less than
    +1.50, the near would be good through them and the distance not too badly

    Using a regular bifocal or progressive with the top portion set to mid range
    and bottom portion set to near is a viable option for computer users.

    The Access lens is not for outdoor use, no one should attempt to drive with
    it and users are clearly told this.

    Dr Judy
    Dr Judy, Oct 7, 2003
  6. The Real Bev

    The Real Bev Guest

    Thanks, both messages have been forwarded to the friend.
    The Real Bev, Oct 7, 2003
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