Re: New glasses OT
- From: Chris Malcolm <cam@xxxxxxxxxxxxxxxxx>
- Date: 31 Aug 2010 09:53:56 GMT
ellerby <ellerby@xxxxxxxxxxxxxxxxxxxx> wrote:
On Mon, 23 Aug 2010 22:29:21 -0700 in alt.support.diabetes Julie Bove
"Ellen K." <firstinitiallastname@xxxxxxxxxxxxxx> wrote in message
Lenses for astigmatism (or that include a prism, or both) could cause the
distortion you're perceiving, i.e. when you go without glasses you
mentally adjust for the distortion your eyes create, so when the lenses
correct for it, your brain is now over-adjusting.
Ah! That's probably it then. I do have astigmatism. Around the house I
usually go without glasses. And I usually take them off to use the
computer. But oddly these seem fine with the computer. I am nearsighted so
I usually have to take them off to read. But the computer seems to be the
right distance away.
When I got my first glasses (5th grade), when walking along the foot path
it was "rearing up" at about 60 degrees. Quite a ride.
That only lasted about a day or so, but the experience did help me to
handle teenage drunken walking some years later. Which was nice. ;-)
I have astigmatism.
These unbalancing perspective and distance distortion problems of
glasses are at their worst when looking through the edges of the
lens. And it's the out-of-the-corner-of-the-eye glimpses of large
verticals and horizontals in the eye's entire wide field of view which
we use in part to balance, place feet, etc..
That distance and perspective distortion at the edges of the lens gets
worse the stronger the glasses. So it's a pretty severe problem with
my very strong specs.
I get round the problem quite literally by having specs with very
small lenses. So all my out-of-the-corner-of-the-eye glimpses go right
past the edge of the lens. So my sense of verticals and horizontals
and ground distance etc as I move around suffer from no distortion
from glasses. So despite my very strong lenses I can easily run up and
down stairs two at a time etc.. Changing specs or removing them makes
no difference. So despite being a spectacle wearer I preserve the
accurate fast instinctive judgements of distance, verticality,
proximity, etc. of those who don't wear specs. In fact I think I can
still run skip and jump over a boulder field faster than most people
half my age who don't wear specs :-)
IMHO these problems of uncertain footing etc. arise from using
fashionable large spectacle lenses. Fashionable, possibly prettier,
but not I think optically and physiologically optimum :-)
- Re: New glasses OT
- From: Julie Bove
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