Halos

Discussion in 'Optometry Archives' started by Zetsu, Jul 3, 2009.

  1. Zetsu

    Zetsu Guest

    [...]

    When the eye with normal sight looks at the large letters on the
    Snellen test card, at any distance from twenty feet to six inches or
    less, it sees, at the inner and outer edges and in the openings of the
    round letters, a white more intense than the margin of the card.
    Similarly, when such an eye reads fine print, the spaces between the
    lines and the letters and the openings of the letters appear whiter
    than the margin of the page, while streaks of an even more intense
    white may be seen along the edges of the lines of letters. These
    "halos" are sometimes seen so vividly that in order to convince people
    they are illusions it is often necessary to cover the letters, when
    they at once disappear. Patients with imperfect sight also see the
    halos, though less perfectly, and when they understand that they are
    imagined, they often become able to imagine them where they had not
    been seen before, or to increase their vividness, in which case the
    sight always improves. This can be done by imagining the appearances
    first with the eyes closed, and then looking at the card, or at fine
    print, and imagining them there. By alternating these two acts of
    imagination the sight is often improved rapidly. It is best to begin
    the practice at the point at which the halos are seen, or can be
    imagined best. Nearsighted patients are usually able to see them at
    the near-point, sometimes very vividly. Farsighted people may also see
    them best at this point, although their sight for form may be best at
    the distance.

    ____

    Better Eyesight
    A monthly magazine devoted to the prevention and cure of imperfect
    sight without glasses
    Copyright, 1919, by the Central Fixation Publishing Company
    Editor - W. H. Bates, M.D.
    Publisher - Central Fixation Publishing Co.
    $2.00 per year, 20 cents per copy
    39-45 East 42nd Street, New York, N. Y.
    Vol. II - February, 1920 - No. 2
    ____

    [...]
     
    Zetsu, Jul 3, 2009
    #1
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  2. Zetsu

    Jan Guest

    Zetsu schreef:

    A major snip made in a copy and paste.. by Zetsu, a layman without any
    notice of what he/she is talking about, of very very old stuff from the
    days WW 1 has just ended.

    BTW, have you any ideas of your own instead of these "copy and past"stuff?

    Jan (normally Dutch spoken)
     
    Jan, Jul 3, 2009
    #2
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