Measurement of Goldmann applanation tonometer calibration error

Ophthalmology
Nikhil S ChoudhariNamrata Dudeja

Abstract

To determine the frequency and possible origins of calibration errors of the Goldmann applanation tonometer and to investigate intraobserver and interobserver agreement in the measurement of such calibration errors. Evaluation of diagnostic test or technology. One hundred thirty-two slit-lamp-mounted Haag-Streit Goldmann tonometers (Model AT 900 C/M; Haag-Streit, Bern, Switzerland). Calibration error testing was performed using the standard calibration error check weight bar. A single observer tested 25 instruments on 2 consecutive days. Two observers independently measured calibration errors of another 40 instruments. A single observer performed prospective testing of the remaining Haag-Streit Goldmann tonometers, 6 months after their annual calibration by the bioengineering department of the hospital. Four months later, the same observer retested the instruments that were found to be faulty earlier. Goldmann applanation tonometer calibration error. Only 4% of Goldmann tonometers were found to be within the manufacturer's recommended calibration error tolerance (+/-0.5 mmHg) at 20 mmHg. Twenty-eight percent of instruments had calibration errors of more than +/-2 mmHg at the 20-mmHg testing level. An additional 12.12% had calib...Continue Reading

References

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May 5, 2005·Journal of Glaucoma·Sukhpal Singh SandhuNeeta Ray-Chaudhuri
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Citations

Dec 11, 2014·Indian Journal of Ophthalmology·Nikhil S ChoudhariChandra Sekhar Garudadri
Dec 11, 2014·Indian Journal of Ophthalmology·Sundaram Natarajan
Jul 31, 2012·American Journal of Ophthalmology·Nandini G GandhiSharon F Freedman
Dec 2, 2009·Ophthalmology·Nishant KumarMark Batterbury
Jan 3, 2009·Ophthalmology·James D Brandt
Oct 17, 2015·International Ophthalmology·Mary O UgalahiAderonke M Baiyeroju
Jun 13, 2015·Asia-Pacific Journal of Ophthalmology·Brenda Nuyen, Kaweh Mansouri
Jan 17, 2015·Current Opinion in Ophthalmology·Kingsley C Okafor, James D Brandt
Oct 18, 2016·Journal of Glaucoma·Nikhil S ChoudhariChandra Sekhar Garudadri
Nov 5, 2016·Journal of Glaucoma·Nikhil S ChoudhariChandra S Garudadri
Apr 6, 2019·Journal of Glaucoma·Nikhil S ChoudhariGarudadri Chandra Sekhar
Sep 26, 2020·Indian Journal of Ophthalmology·Judy JoseT Nagarajan
Sep 26, 2020·The British Journal of Ophthalmology·Gus GazzardDavid S Friedman
Nov 5, 2010·Journal of Glaucoma·Nikhil Shreeram ChoudhariLingam Vijaya
Sep 1, 2012·Journal of Current Glaucoma Practice·Rajat MaheshwariManav Deep Singh

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