New lenses are odd...

Discussion in 'Optometry Archives' started by jack, Oct 21, 2008.

  1. jack

    jack Guest

    I lost my glasses and got a new pair.
    Comparing them to my safety glasses of the same prescription, I find the new
    glasses are clearer both reading and driving; so overall I like them.
    But... when I look down at my dinner plate, it looks like it is tilted away
    from me because the nearest part is noticably more magnified than the top.
    (so it seems nearer than it is... tilted away from me). My safety glasses
    don't do this at all.

    The safety glasses are polycarbonate; the new glasses are trivex.

    Is one prescription wrong, does the different material do it, or maybe it is
    just an idiosycracy of one of the lense designs. What do you think?
    jack, Oct 21, 2008
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  2. jack

    Mark A Guest

    Most likely the new lenses are aspheric and the old ones where spherical. An
    aspheric lens has many advantages for a high power Rx (thinner and lighter),
    but it is sensitive to the optical center of the lens being positioned
    exactly where your pupil is located.

    Both polycarb and Trivex are safety lenses because they have very high
    tensile strength and impact resistance.
    Mark A, Oct 22, 2008
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