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I have no idea who designed this website or took that photo but THAT IS NOT AN ACCURATE DESCRIPTION of what you should see when using the Goldman Applination Tonometer. The half circles pictured show the GREEN (as it should be) circles touching on the inner portion of each other and this is EXTREMELY INNACURATE. These half GREEN circles should just barley touch each other just on the outside of each other. If you were to use the IOP reading using this image you would have an inaccurate reading.
Comment by Tech — February 19, 2009 @ 12:17 pm
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No offense, Tech, but I think the picture and description on this page is actually pretty acurate. You want the INSIDE edges of the circles to barely touch each other for an accurate reading. That is what you see in this photo, and more importantly, what is demonstrated from the associated video.
The prism built into the applanation tip is set so that when a perfect 3mm diameter area of cornea is flattened, the INSIDE edges of the mires touch. It doesn’t make sense to lineup the outside edges of the mires … as the outside edge of those circles vary in size depending upon how much fluoresceine is in the tear film.
You may want to check to see if you have been checking your pressures correctly. Also, you might find it useful to run a google image search on the word “applanation” - you’ll see that everyone else is making the INSIDE edges line up as well.
Comment by Doctor — February 19, 2009 @ 10:45 pm
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i just want to ask is the mire size accurate in this photo? the width of the mire should be like this?
Comment by shaniece — October 28, 2009 @ 3:48 am
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Yep … width looks correct.
In general, the skinnier the mire width, the easier it is to line up and measure. This means, you should use as little fleuroscein as you can get away with. Put the drop in, have the patient dab as much out as they can, wait a little while, dab more … then applanate.
The hardest eyes to applanate are those filled with yellow dye and who blink a lot during pressure check. The dye gets all over the applanation tip and makes the mires too thick to read properly.
Comment by Doctor — October 28, 2009 @ 6:43 am
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hi,
what causes the flouroscent semicircles to appear,are created by using the prism,how many prisms we use 1 or 2
Comment by sudheer — November 7, 2009 @ 11:50 am
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