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Failed a field vision test.

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thx1138
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PostPosted: 18:41 - 01 Nov 2017    Post subject: Failed a field vision test. Reply with quote

Just went to opticians, did the usual tests, not been for three years. Still got above average long sight, reading glasses prescription stays the same, blew air in my eyes the usual.

Then did a field vision test, close an eye, click the button when I see the light, and repeat.I waited for results, and... missed loads with left eye, almost none with right.

Appointment made to go back and repeat test.

My dad has Glaucoma as did his dad before him.

Had a look on here;
https://www.nhs.uk/conditions/glaucoma/diagnosis/

So my question is, can glaucoma be diagnosed with a field vision test, or can it only be diagnosed by other means, and a field vision test would assess damage caused? (in which case, presumably I have some other sort of problem, or non at all)
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M.C
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PostPosted: 18:57 - 01 Nov 2017    Post subject: Reply with quote

[Not being helpful] I love how they blow air and shine bright lights into your eyes then ask you to read letters off a chart.
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iooi
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PostPosted: 19:00 - 01 Nov 2017    Post subject: Re: Failed a field vision test. Reply with quote

thx1138 wrote:


So my question is, can glaucoma be diagnosed with a field vision test, or can it only be diagnosed by other means, and a field vision test would assess damage caused? (in which case, presumably I have some other sort of problem, or non at all)


Well it can be a pointer to it.

Quote:
Many eye and brain disorders can cause peripheral vision loss and other visual field abnormalities. Visual field tests are performed by eye care professionals to detect blind spots (scotomas) and other visual field defects, which can be an early sign of these problems

The size and shape of a scotoma offer important clues about the presence and severity of diseases of the eye, optic nerve and visual structures in the brain. For example, optic nerve damage caused by glaucoma creates a very specific visual field defect

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stinkwheel
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PostPosted: 19:28 - 01 Nov 2017    Post subject: Reply with quote

It's diagnosed in animals using a tonometer which measures the pressure inside your eye but they are an instrument designed for use in humans so I presume this to the the case in them too.

You put local anaesthetic in the eye and touch the tonometer against the surface of the eyeball. It has a little metal rod inside (like a rounded off needle bearing) which is drops onto the eye surface and measures how high it bounces. That then tells you the intraoccular pressure.

They'd probably want to look round the drainage angle with a special lens that goes up against the surface of the eye and possibly ultrasound it too if they were suspicious of glaucoma.
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Freddyfruitba...
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PostPosted: 19:53 - 01 Nov 2017    Post subject: Reply with quote

stinkwheel wrote:
It's diagnosed in animals using a tonometer which measures the pressure inside your eye but they are an instrument designed for use in humans so I presume this to the the case in them too.

Yep. The afore-mentioned 'air puff' test is also tonometry (it works by assessing the deflection of the front of your eyeball); but I think it's a fairly rough-and-ready screening test rather than one which will give a definitive diagnosis of glaucoma.
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andym
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PostPosted: 04:38 - 02 Nov 2017    Post subject: Reply with quote

I had an eye test a couple of months ago and noticed they changed the machine that does the field of vision test..... I was OK when it was the good ol' LED's inside the chamber that stuck with a constant light level.... the new one was just 1 light moving around and could be so dim it was almost impossible to see when right in front of my eye Confused
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MCN
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PostPosted: 15:55 - 02 Nov 2017    Post subject: Reply with quote

andym wrote:
I had an eye test a couple of months ago and noticed they changed the machine that does the field of vision test..... I was OK when it was the good ol' LED's inside the chamber that stuck with a constant light level.... the new one was just 1 light moving around and could be so dim it was almost impossible to see when right in front of my eye Confused



But your light receptors get worser and worser as your eyes get older.

Crying or Very sad
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MinhDinh
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PostPosted: 19:41 - 09 Nov 2017    Post subject: Reply with quote

I use to work in an Opticians. I believe if your pressures were above 21, it's a case for concern.

A field of vision test is definitely an indicator, but some are better than others at it. A good machine will tell the person if it is done correctly or there were faults.

If you are over 40, your eye tests should be done annually and is paid by the NHS. I recommend you do it every year to be on the safe side because it can affect a driving license.
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UnknownStuntm...
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PostPosted: 09:08 - 10 Nov 2017    Post subject: Re: Failed a field vision test. Reply with quote

thx1138 wrote:
not been for three years.

There's your mistake...
thx1138 wrote:
My dad has Glaucoma as did his dad before him.

[Shakes head]
If you go regularly, the images they take of the blood vessels and nerves inside the eyes can be a far greater indicator of change and potential problems. The best reference is last years pic, which they look at side by side with your current pic.
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RhynoCZ
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PostPosted: 10:17 - 10 Nov 2017    Post subject: Re: Failed a field vision test. Reply with quote

thx1138 wrote:

My dad has Glaucoma as did his dad before him.

So my question is, can glaucoma be diagnosed with a field vision test, or can it only be diagnosed by other means, and a field vision test would assess damage caused? (in which case, presumably I have some other sort of problem, or non at all)


Yes, it is hereditary. My father has it, his brother has it too and their father as well. I'm being tested every year, my brother says feck it. I'm nearsighted, so I would go to a ophthalmologist (an actuall doctor with a proper degree, not just a optician who did a short course on how to sell ugly glasses to nice people) anyway.

The field vision test only shows when something is wrong. I also had the test Stinkwheel described, although my doctor said it's quite on a theoretical level.

You can always ask to do the field vision test again elsewere, on a different machine. The very old method was a halfsphere with a specialist who would move a point (a source of light mostly) around on the halfsphere and the patient would say, if he can see it.

You may even test your vision at home. Get a ''square/grid paper'', not sure about the right English word here, it's a paper with grid on it. Put this on the table, close one of your eyes (cover it with your hand) and look at the paper, if you see all the squares of the grid, you are alright, if some are missing, you might have glaucoma.

I also have yearly what UnknownStuntman is describing, the ''inside of the eye look'', the best test there is, not that it would be 100% accurate, but it only takes a few secconds, unlike the field vision test with the clicker.

Now for the scary part, any glaucoma related damage is irreversible. If caught early, there are 3 options.
1) leave it and monitor the situation is not getting worse
2) eye drops to releave the pressure (my father uses them, not sure what it does but it stops glaucoma)
3) eye surgery (releaves pressure)

On an even scarier note, if you go to a doctor the moment you feel something is wrong, it's already too late. Thumbs Down

One of the telling signs of glaucoma is perfect eyesight, if you can see even the smallest letters on the eyesight test board on the wall.
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V2
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PostPosted: 11:41 - 12 Nov 2017    Post subject: Reply with quote

If you can't see the field then you should stop the off road riding
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Ariel Badger
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PostPosted: 22:43 - 12 Nov 2017    Post subject: Reply with quote

MinhDinh wrote:
I use to work in an Opticians. I believe if your pressures were above 21, it's a case for concern.


After an operation I hit 54, it caused a lot of concern.
The puff test is not accurate, Goldmann tonometry is considered to be the gold standard IOP test and is the most widely accepted method. A special disinfected prism is mounted on the tonometer head and then placed against the cornea. The examiner then uses a cobalt blue filter to view two green semi circles. The force applied to the tonometer head is then adjusted using a dial connected to a variable tension spring until the inner edges of the green semicircles in the viewfinder meet. When an area of 3.06 mm (0.120 in) has been flattened, the opposing forces of corneal rigidity and the tear film are roughly approximate and cancel each other out allowing the pressure in the eye to be determined from the force applied. Like all non-invasive methods, it is inherently imprecise and may need to be adjusted.
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Jewlio Rides Again LLB
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PostPosted: 22:56 - 12 Nov 2017    Post subject: Reply with quote

Ariel Badger wrote:
MinhDinh wrote:
I use to work in an Opticians. I believe if your pressures were above 21, it's a case for concern.


After an operation I hit 54, it caused a lot of concern.
The puff test is not accurate, Goldmann tonometry is considered to be the gold standard IOP test and is the most widely accepted method. A special disinfected prism is mounted on the tonometer head and then placed against the cornea. The examiner then uses a cobalt blue filter to view two green semi circles. The force applied to the tonometer head is then adjusted using a dial connected to a variable tension spring until the inner edges of the green semicircles in the viewfinder meet. When an area of 3.06 mm (0.120 in) has been flattened, the opposing forces of corneal rigidity and the tear film are roughly approximate and cancel each other out allowing the pressure in the eye to be determined from the force applied. Like all non-invasive methods, it is inherently imprecise and may need to be adjusted.


I have absolutely no idea what any of that means, but it sounds cool as fuck. Thumbs Up
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supZ
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PostPosted: 00:31 - 13 Nov 2017    Post subject: Re: Failed a field vision test. Reply with quote

thx1138 wrote:

My dad has Glaucoma as did his dad before him.


The puff test is for glaucoma.

Vision test is more for cataracts or other things that can obscure your vision.

#notanexpertthough
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UnknownStuntm...
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PostPosted: 09:10 - 13 Nov 2017    Post subject: Re: Failed a field vision test. Reply with quote

supZ wrote:
The puff test is for glaucoma.

Vision test is more for cataracts or other things that can obscure your vision.

Hmm....
supZ wrote:
#notanexpertthough

Well that bit is at least correct.... Laughing
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supZ
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PostPosted: 11:37 - 13 Nov 2017    Post subject: Re: Failed a field vision test. Reply with quote

UnknownStuntman wrote:
supZ wrote:
The puff test is for glaucoma.

Vision test is more for cataracts or other things that can obscure your vision.

Hmm....
supZ wrote:
#notanexpertthough

Well that bit is at least correct.... Laughing


Quote:

Why does the optician blow air into my eyes during the eye examination?
Answer:

This is part of a test which measures your intraocular pressure (IOP) using a tonometer - a raised IOP can indicate a problem with the eye such as glaucoma.


https://www.specsavers.co.uk/help-and-faqs/why-does-the-optician-blow-air-into-my-eyes-during-the-eye-examination

At least that's correct.

https://www.glaucoma.org/treatment/why-do-i-need-a-visual-field-test.php

I had no idea the visual field test was related to glaucoma. Every time I go to the opticians I have to be referred to a specialist as I always read high pressure but it's actually just because my corneas are quite thick so I read a higher pressure.

Not once have I been told or asked to do a visual field test in relation to it. Only time I've had one was because of the mild cataracts I have.
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