intraocular pressure

Fluctuating Intraocular Pressure

Submitted by Agnes on Sun, 10/11/2009 - 1:09pm

NOTICE: If you are engaged in self-tonometry and you have questions about your daily intraocular pressure fluctuations, you should read this comment about the difference in the way fluctuations are defined by mainstream ophthalmology and the fluctuations we observe in self-tonometry.

I will further preface this article by saying that I do not believe there has been a study done where subjects with normal, healthy eyes performed self-tonometry the way we are doing it.

I urge caution in comparing self-tonometry data against the data being discussed by Dr. Rick Wilson below.

It is good to try to understand as much as we can. However, I believe it is not good to misinterpret your own self-tonometry data -- or to jump to incorrect conclusions based on the apples and oranges fallacy.

-- admin

On Wednesday, May 18, 2005, Dr. Rick Wilson a glaucoma specialist at Wills, and the glaucoma chat group discussed "Fluctuating IOP's."

Moderator:  Tonight's topic concerns fluctuating intraocular pressures (IOPs).  In a recent chat, you said studies have shown that fluctuating IOPs are more of a risk factor than a somewhat higher, but steady IOP.  Why is that?


Dr. Rick Wilson:  We are not sure. Several studies have shown glaucoma patients do not auto-regulate their circulation as well as patients without glaucoma.  In other words, if a patient's blood pressure increases suddenly, it pushes more blood into the eye, and the added blood flow and pressure cause more aqueous to be made.  A normal eye would sense the change and constrict the blood vessels to reduce the flow of the blood under higher pressure back to normal.


P:  Is that called "autoregulation?"


Dr. Rick Wilson:  Correct. Autoregulation should take place with decreased blood flow or pressure, increased metabolic needs of the eye, etc.  Clearly, a fluctuating IOP requires the eye to continually auto-regulate the blood flow to keep the optic nerve well supplied with oxygen and nutrients.  That may be onerous for the glaucomatous eye.


P:  Isn't some amount of IOP fluctuation normal even in healthy eyes?  For example, aren't pressures expected to be higher in the morning than in the later part of the day?  In any case, how much of a spread in IOP is considered normal?

Vitamin help for glaucoma and elevated eye pressure

Submitted by Agnes on Tue, 09/29/2009 - 5:19pm

Glaucoma is an eyesight ailment characterized by an increase of pressure of the fluid within the eyeball.  This increased pressure causes abnormal changes in the optic nerve and defects in the field of vision.

Monitoring Intraocular Pressure Following Macular Hole Surgery

Submitted by slclanton on Fri, 09/25/2009 - 3:35pm

My wife lost sight in her right eye 6 years ago due to post operative glaucoma following macular hole surgery. She has now developed a macular hole in the left eye and will have to ungergo the same surgery. We want to do everything possible to make the same outcome less likely.

Filed Under (tags):

What would you do?

Submitted by belann on Sun, 09/13/2009 - 5:35pm

I have been reading the FitEyes posts for a long time now—hoping that I could get some ideas of how to preserve my vision in my only good eye.  Here is a little of my history.  I was diagnosed with glaucoma in 1989.  I can’t even remember what the pressures were at that time because I had no frame of reference.   All I know is that about four years later I had ALT laser to both eyes, and the doctor was gratified that he was able to get the pressure down to 18.  It didn’t last, but it was an initial victory.  Other than the short time after the laser, my pressures ran around 30 in both eyes.

glucosamine chondroitin and intraocular pressure

Submitted by Anonymous (not verified) on Thu, 09/03/2009 - 11:19pm

Author’s Note:  I have been practicing self-tonometry now for about three weeks with a Reichert 7 NCT.

For the past 9 years, I have been supplementing with glucosamine chondroitin to ward off joint issues due to an intense daily exercise regimen.  I’ll never know for sure whether this supplement works as advertised since I began taking it as a preventative measure and to this day do not suffer from joint pain.  However, when I read recently on the internet that chondroitin can possibly make matters worse for glaucoma patients, I dropped the supplement overnight and did not wean myself off it.  This action may have led to the unintended result which I describe below.

Self-tonometry in glaucoma management--past, present and future

Submitted by Anonymous (not verified) on Tue, 09/01/2009 - 9:00pm

Glaucoma is the leading cause of irreversible blindness in the world. Diagnosis and management of glaucoma is significantly associated with intraocular pressure, but contemporary office-based measurements are not sufficient to discover diurnal changes and spikes, nor do they demonstrate the effect of medication and compliance. Patient-directed self-tonometry can be taken throughout the day and is therefore the subject of much discussion and research. In this article we review the history of self-tonometry devices and present technologies for the future.
Surv Ophthalmol. 2009 Jul-Aug;54(4):450-62.
Liang SY, Lee GA, Shields D.
City Eye Centre, Brisbane, Queensland, Australia.

Relationship of Incident Glaucoma versus Physical Activity and Fitness in Male Runners

Submitted by dave on Mon, 08/17/2009 - 1:47pm

runningPurpose: To assess the dose-response relationship of vigorous physical activity (running distance, km·d-1) or cardiorespiratory fitness (meters-per-second pace during a 10-km footrace) to the risk for incident glaucoma.

Conclusions: These data provide preliminary evidence that vigorous physical activity may reduce glaucoma risk, which, in the absence of medical record validation, could represent ocular hypertension in addition to frank glaucoma. Additional follow-up with validation is needed to identify the type of glaucoma affected.

See full text article attached.


Omega-3 Fatty Acids Lower Eye Pressure

Submitted by dave on Sun, 08/16/2009 - 9:15pm

Read the summary of University of Melbourne's Department of Optometry and Vision Sciences study on an association between dietary omega-3 fatty acid intake, age, and intraocular pressure. Another proof of beneficial effect of taking fish oil to strengthen and support healthy eyes and vision.

Aerobic exercise and intraocular pressure in normotensive and glaucoma patients

Submitted by dave on Fri, 08/14/2009 - 2:31pm


With the increasing number of people participating in physical aerobic exercise, jogging in particular, we considered that it would be worth knowing if there are should be limits to the exercise with regard to the intraocular pressure (IOP) of the eyes. The purpose of this study is to check IOP in healthy and primary glaucoma patients after aerobic exercise.



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