Magnification without glasses?

Discussion in 'Glasses' started by Ioannis, May 22, 2007.

  1. Ioannis

    Ioannis Guest

    As a nearsighted person with some mild presbyopia, I only need to take off my
    myopia glasses to do fine work up close.

    Lately I am of the impression that the closeup view without my glasses gives
    me some very mild magnification. Perhaps of the order of 1.1X or thereabouts.

    Is this "magnification" subjective (contrast between images with glasses and
    without glasses ) or is it real?

    Thanks,
     
    Ioannis, May 22, 2007
    #1
    1. Advertisements

  2. No, without glasses, you can focus at a closer distance than those with
    "normal" vision, so it is real.

    I'm very nearsighted and basically have a 5-10X magnifier built into my
    head when I remove my glasses. :)

    --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
    Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
    +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
    | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

    Important: Anything sent to the email address in the message header above is
    ignored unless my full name AND either lasers or electronics is included in the
    subject line. Or, you can contact me via the Feedback Form in the FAQs.
     
    Sam Goldwasser, May 22, 2007
    #2
    1. Advertisements

  3. Ioannis

    Salmon Egg Guest

    That is exactly what magnifiers do! A magnifier, such as a hand lens, allows
    you to get closer to the object. In ioannis's situation, he could get the
    same effect using his glasses and using a hand lens simultaneously. It is
    easier to just not use the hand lens and not use the glasses as well.
    Whether you wish to call that magnification or not is just a matter of
    definition.

    Bill
    -- Fermez le Bush--about two years to go.
     
    Salmon Egg, May 22, 2007
    #3
  4. Ioannis

    Jan Guest

    Dr Judy schreef:
    Come on Dr Judy,I now you can do better.
    What about the same myopic wearing contacts?
    "abnormal size"?

    Jan (normally Dutch spoken)
     
    Jan, May 22, 2007
    #4
  5. Ioannis

    Jan Guest

    Dr Judy schreef:
    Come on Dr Judy,I know you can do better.
    What about the same myopic wearing contacts?
    "abnormal size"?

    Jan (normally Dutch spoken)
     
    Jan, May 22, 2007
    #5
  6. Ioannis

    Ms.Brainy Guest

    I am not an optician, optometrist, ophthalmologist etc., not even a
    physicist or engineer, but please allow me.

    It seems you all ignore the fact that vision processing is done in the
    brain, not in the eye. The image of an elephant on the retina is
    always minimized, obviously. Not only that, it's also upside down.
    However, the brain perceives the miniature retinal elephant standing
    on its head as a full size upright elephant. Our brain learns how to
    process the retinal image in a very young age.

    The only time we really notice this minimization is when we switch
    from no lens to a minus lens or to a stronger lens, but this lasts
    only for a very short time. In other words, the size of the retinal
    image is almost irrelevant and is only relative. Of course, a great
    disparity between the lenses on both eyes will confuse the brain...
     
    Ms.Brainy, May 22, 2007
    #6
  7. Ioannis

    Jan Guest

    Ms.Brainy schreef:
    I do......
    Is that true, never thought of it.

    The image of an elephant on the retina is
    Well, why not walk right to this elephant and look him in the eye,
    enormous image, is it not?
    Watch out by trying this, you easily could be minimized.

    Not only that, it's also upside down.

    No......., realy?
    I am a fan of the circus but elephants standing on their head is new to
    me...

    as a full size upright elephant. Our brain learns how to
    Is that so...
    Dear Brainy, only when the lens is held at some distance in front of the
    eye.

    In other words, the size of the retinal
    Bullshit of this elephant, when you are standing next to this elephant
    the size of your head looks a lot smaller to me as the elephant's does

    Of course, a great
    Not always Brainy.

    Jan (normally Duch spoken)
     
    Jan, May 22, 2007
    #7
  8. Ioannis

    Salmon Egg Guest

    So removing eyeglasses allows you to get closer to the object and provides a
    larger clear image on the retina just as if you used a magnifying glass with
    the eyeglasses. That sounds like magnification to me.

    Bill

    -- Fermez le Bush--about two years to go.
     
    Salmon Egg, May 23, 2007
    #8
  9. Ioannis

    otisbrown Guest

    Dear Brainy,

    Welcome to the "attitude" of the majority-opinion OD.

    He normally thinks he is a "God", and by that
    standard, everyone -- the public, the patient, YOU --
    are stupid, and must be "corrected" in every way
    possible, and insulted to boot.

    Just remember, there are second-opinion ODs who
    are not like this. They will reason with you
    and RESPECT you and your goals in life.
    That is why I post here -- to show respect
    to people like Steve Leung OD.

    www.chinamyopia.org

    Best,

    Otis
     
    otisbrown, May 23, 2007
    #9
  10. Ioannis

    Ms.Brainy Guest

    Jan is a "he"? If so, I apologize for assuming it's a "she". I
    certainly did not intend to MINIFY him into a female. And vice versa.
     
    Ms.Brainy, May 23, 2007
    #10
  11. Ioannis

    Neil Brooks Guest

    I actually don't know for certain, but--in Holland--Jan is commonly a
    male's name.
     
    Neil Brooks, May 23, 2007
    #11
    1. Advertisements

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.