Off-axis distortion

Discussion in 'Optometry Archives' started by Tony Houghton, Oct 31, 2009.

  1. I noticed a problem with my new glasses:- things looked out of focus
    when I was looking downwards. If I tilted them (top away from my face,
    bottom towards it) that improved it a lot. I bent the angle between the
    arms and frame as much as seemed reasonable, and it's improved the
    vision in the bottom portion of the lenses, but at the expense of vision
    looking upwards, which is now quite distorted, and the downwards vision
    still isn't as good as my old glasses. I also noticed that the effect
    seems more pronounced in one eye than the other.

    I already had the lenses changed because I knew they weren't right and
    they were giving me headaches, but I couldn't work out what was wrong,
    so I downgraded the lens material from 1.6 to 1.5 plastic thinking it
    might be due to too much dispersion (although I've had 1.6 before which
    were OK).

    What are likely causes? I'm guessing it's mainly because the lenses are
    too flat, but I wondered seeing as it's worse in one eye than the other,
    could it be they're miscorrecting my astigmatism, or would the
    differences between each eye's prescription cause a slight difference in
    the experience of too-flat lenses? The prescription is -6.25 -0.75 10
    and -6.75 -0.5 37, and it's the first of those which seems a tad worse.
    The only differences from my old prescription are that the axes have
    changed from 15 and 42.5.
    Tony Houghton, Oct 31, 2009
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