Glaucoma tests – not just eye pressure! Visual fields and Optical Coherence Tomography OCT (3)


– So, increased pressure, intraocular pressure,
is not their only test for glaucoma, in fact, it’s several tests looking at the back of
the eye with the ophthalmoscope and also measuring visual fields – Yes…
Dr. Anton Titov MD – So, all the tests taken together can establish
the diagnosis that someone might have a silent glaucoma? – Yes, because it is silent, you need objective
ways of measuring whether the disease is present or not. And one of the things also that we’ve become
increasingly aware of is even though the gold standard is the visual field, actually there
has to be quite a lot of your nerve cells lost, before the visual field is affected. So, one of the things that has developed over
the last few years is the ability to see if you’re progressing with your visual field
loss, or if you’re progressing with your OCT [Optical Coherence Tomography] measurements
looking at your retinal nerve fiber there as an indicator that you have disease. if it’s such, if you’re sort of borderline. – [AT] So, seeing if a peripheral field vision
changes are progressing over the time, – [FC] Exactly… – [AT] That underscores the importance of
having the visual field test done, even if a person has normal vision and no complaints
about vision – to establish the baseline. – Yes, that’s absolutely true. But one of the things that has been coming
through is our ability to image the back of the eye has improved over the last 10 years. One of the big advances is being the use of
Optical Coherence Tomography [OCT]. So, this is basically almost doing what one
would call a non-histological optical section of the eye So, the retina consists of lots
of different layers of nerve cells. And they’re all specialized but they’re all
damaged differently in the disease. Now, in glaucoma, as I said, the top layer
is the retinal ganglion cells, so we know that that top layer thins sometimes, even
before you have any changes on your visual field test. So, if you can look for changes of that decline
in the thickness of that layer, that in itself is an indicator, perhaps, that your visual
field is going to be lost in the future.

Leave a Reply

Your email address will not be published. Required fields are marked *