accuracy

Tonometers and Accuracy

Submitted by pinollxer on Sat, 03/16/2013 - 1:49pm

I have need of a home tonometer but am concerned about their accuracy at the higher pressures, i.e., in the 25 to 35 IOP range. I have noticed that most of the manufacturers’ data, when comparing to the GAT is in the normal range (16 to 21). This has little value to me since for the past 23 years my pressures have been in the mid to high twenties. I have had no vision loss and no indication of any change to the optic nerve.

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Air-puff vs Goldmann... again

Submitted by lzajdel2002 on Thu, 01/20/2011 - 6:54pm

I went right to our Walmart optical after having my IOP's read by my opthamoligist using a Goldman tonometer. The MD readings were 24 left and 23 right. Walmart used an air-puff and produced 28 left and 33 right. When I informed the Walmart optician of my experiment and the results, they remeasured the right, this time yielding 29. I know the relative accuracy and repeatibilty of these two instruments have been discussed before on this forum, but I feel these differences seem too large.

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