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Science Forum Index » Medicine - Vision Forum » Eye pressures
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| Don W |
 Posted: Sat Apr 26, 2008 10:34 pm |
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Went to an eye talk couple days ago. The following (unresolved) question
came up. When eye pressures are up (say in the posterior part of the eye)
it affects the optic nerve. But pressures are measure in the front of the
eye. The front chamber (anterior) is separated from the back chamber by the
lens, etc. In the front chamber, a liquid solution, in the rear a vitreous
gel. So when the doctor measures the pressure in the front, what gives him
some indication that these two chambers track, that is, their pressures are
about the same?
Don W. |
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| Salmon Egg |
| Posted: Sun Apr 27, 2008 7:57 pm |
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In article <wvSQj.11450$V14.4336@nlpi070.nbdc.sbc.com>,
"Don W" <dwilgus@prodigy.net> wrote:
Quote: Went to an eye talk couple days ago. The following (unresolved) question
came up. When eye pressures are up (say in the posterior part of the eye)
it affects the optic nerve. But pressures are measure in the front of the
eye. The front chamber (anterior) is separated from the back chamber by the
lens, etc. In the front chamber, a liquid solution, in the rear a vitreous
gel. So when the doctor measures the pressure in the front, what gives him
some indication that these two chambers track, that is, their pressures are
about the same?
Don W.
Two words: Pascal's Law.
Bill |
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| Dave Bell |
| Posted: Sun Apr 27, 2008 9:04 pm |
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Salmon Egg wrote:
Quote: In article <wvSQj.11450$V14.4336@nlpi070.nbdc.sbc.com>,
"Don W" <dwilgus@prodigy.net> wrote:
Went to an eye talk couple days ago. The following (unresolved) question
came up. When eye pressures are up (say in the posterior part of the eye)
it affects the optic nerve. But pressures are measure in the front of the
eye. The front chamber (anterior) is separated from the back chamber by the
lens, etc. In the front chamber, a liquid solution, in the rear a vitreous
gel. So when the doctor measures the pressure in the front, what gives him
some indication that these two chambers track, that is, their pressures are
about the same?
Don W.
Two words: Pascal's Law.
Bill
That and the fact that the pars plana (lens, etc.) is not a rigid structure.
Dave |
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| Salmon Egg |
| Posted: Mon Apr 28, 2008 1:19 am |
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In article <cjaRj.23220$%41.18932@nlpi064.nbdc.sbc.com>,
Dave Bell <dbell@TheSPAMFREEBells.net> wrote:
Quote: That and the fact that the pars plana (lens, etc.) is not a rigid structure.
From what I understand, the most likely source of error is a thick
cornea that does not act like a baloon. At least with the pneumatic
measurement technique. |
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| Dr Judy |
| Posted: Mon Apr 28, 2008 5:53 am |
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On Apr 26, 11:34 pm, "Don W" <dwil...@prodigy.net> wrote:
Quote: Went to an eye talk couple days ago. The following (unresolved) question
came up. When eye pressures are up (say in the posterior part of the eye)
it affects the optic nerve. But pressures are measure in the front of the
eye. The front chamber (anterior) is separated from the back chamber by the
lens, etc. In the front chamber, a liquid solution, in the rear a vitreous
gel. So when the doctor measures the pressure in the front, what gives him
some indication that these two chambers track, that is, their pressures are
about the same?
Don W.
The fluid in the two chambers is connected. Aqueous humour (front
liquid) is produced behind the lens and flows through the pupil to the
front.
Dr Judy |
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