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Science Forum Index » Medicine - Vision Forum » interpupillary measurement
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| dacconverter |
 Posted: Tue Apr 29, 2008 3:22 pm |
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Guest
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How can one tell if the inter-pupillary distance measured for one's
eyewear is incorrect?
When I turn my head all the way to the right and look towards the
left, certain straight-line images appear curved.
Is this normal? ( my previous eyewear wasn't like that ) |
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| Guest |
| Posted: Tue Apr 29, 2008 3:32 pm |
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Dear Digital-to-Analog Converter,
To measure your Pupillary Distance you need a centimeter ruler.
It is relatively simple to make this measurement.
The "average" for an adult is about 64 mm, and for
a child about 57 mm.
Why not check this measurement yourself -- if
you think it is wrong.
Enjoy,
On Apr 29, 9:22 pm, dacconverter <seagate1...@hotmail.com> wrote:
Quote: How can one tell if the inter-pupillary distance measured for one's
eyewear is incorrect?
When I turn my head all the way to the right and look towards the
left, certain straight-line images appear curved.
Is this normal? ( my previous eyewear wasn't like that ) |
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| Back to top |
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| Mike Tyner |
| Posted: Tue Apr 29, 2008 9:40 pm |
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Guest
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Your new glasses have more barrel distortion. It increases with degree of
myopia, distance off the eye, lens thickness and refractive index.
One of those things has changed. Pupil distance isn't usually the culprit.
Often you can relieve the weirdness by shaping the frame to fit closer to
your eyes, to "wrap" around more at the sides, rather than straight across
the nose.
If you put up with it for a week or two, most people adapt and forget it.
Meanwhile ask if they can adjust your frame to reduce the barrel distortion.
Usually they can.
-MT
"dacconverter" <seagate1556@hotmail.com> wrote
Quote: How can one tell if the inter-pupillary distance measured for one's
eyewear is incorrect?
When I turn my head all the way to the right and look towards the
left, certain straight-line images appear curved.
Is this normal? ( my previous eyewear wasn't like that )
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| Zetsu |
| Posted: Thu May 01, 2008 5:40 pm |
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On 30 Apr, 03:40, "Mike Tyner" <mty...@mindspring.com> wrote:
Quote: Your new glasses have more barrel distortion. It increases with degree of
myopia, distance off the eye, lens thickness and refractive index.
One of those things has changed. Pupil distance isn't usually the culprit.
Often you can relieve the weirdness by shaping the frame to fit closer to
your eyes, to "wrap" around more at the sides, rather than straight across
the nose.
If you put up with it for a week or two, most people adapt and forget it.
Is that really normal or natural? I mean, 'just adapt and it will go
away'. It's not exactly solving the root problem. The moral of all
these problems is obvious: glasses is not the solution! Release from
imperfect sight thru rest is! Otherwise you will carry a chronic
tension for the rest of your life! Seriously! |
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