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Science Forum Index » Medicine - Vision Forum » Dilation recovery response time.
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| Revival |
 Posted: Thu Jun 07, 2007 2:34 pm |
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Guest
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okay thank,you mike!
you very kind answer all my questchon. |
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| Mike Tyner |
| Posted: Thu Jun 07, 2007 3:27 pm |
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Guest
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"Don W" <dwilgus@prodigy.net> wrote
Quote: So, are we still talking about the typical spoking effect of the
lens?
The spokes represent areas of varying refractive index. There are minute
prism-like effects such that each area might displace its image slightly,
causing multiple images.
More commonly IMO, it's the cornea that produces the displacements you
describe.
-MT |
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| Don W |
| Posted: Thu Jun 07, 2007 5:41 pm |
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Guest
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On Jun 7, 1:27 pm, "Mike Tyner" <mty...@mindspring.com> wrote:
Quote: "Don W" <dwil...@prodigy.net> wrote
So, are we still talking about the typical spoking effect of the
lens?
The spokes represent areas of varying refractive index. There are minute
prism-like effects such that each area might displace its image slightly,
causing multiple images.
More commonly IMO, it's the cornea that produces the displacements you
describe.
-MT
Thanks. Your comments are of much interest/helpful. Why is the
cornea suspect (IYO)?
Don W. |
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| Mike Tyner |
| Posted: Thu Jun 07, 2007 6:43 pm |
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Guest
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"Don W" <dwilgus@prodigy.net> wrote
Quote: Thanks. Your comments are of much interest/helpful. Why is the
cornea suspect (IYO)?
Because every healthy topograph shows dimples and peaks, and monocular
diplopia is a commonly associated with corneal astigmatism. Mine is. Triple
images indicate a higher-order aberration than simple astigmatism.
If the source is lenticular, your image might jump appreciably as you move
the pinhole around in front of your (dilated) pupil. Corneal variations
would not cause sudden jumps.
-MT |
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| Don W |
| Posted: Fri Jun 08, 2007 4:16 am |
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Guest
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I found out that I can drive safely with dilated pupils
Quote: if I wear my UV protecting sunglasses. I am in sunny southern
Arizona, probably the sunniest place in the U.S., and if I could do it
here (with a thick cataract in one eye), I am confident you can do it
wherever you are. However, night driving is a whole different ordeal
(unbearable glare) -- avoid it!
I would tend to agree with you about the driving. But the sun's
reflection off of rounded car surfaces are pretty rough for me. I
agree 101% about the night driving. Who put those halogens (or
LED's?) into those car's headlamps, anyway?? Or allowed it?
Another thing about night driving with dilation, the street
stoplights tend to elongate in three directions. About 1/2 a light
diameter offset. Green the worst for me. Any theories?
Don W. |
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