Author/Authors :
Amini, Heydar tehran university of medical sciences tums - Farabi Eye Hospital, تهران, ايران , Moghimi, Sasan tehran university of medical sciences tums - Farabi Eye Hospital, تهران, ايران , Golestani, Mahboobe tehran university of medical sciences tums - Farabi Eye Hospital, تهران, ايران , Jabbarvand, Mahmood tehran university of medical sciences tums - Farabi Eye Hospital, تهران, ايران , Zarei, Reza tehran university of medical sciences tums - Farabi Eye Hospital, تهران, ايران , Esmaili, Mohammadreza tehran university of medical sciences tums - Farabi Eye Hospital, تهران, ايران , Esfandiarpour, Zohre tehran university of medical sciences tums - Farabi Eye Hospital, تهران, ايران , Soltani-Moghadam, Reza tehran university of medical sciences tums - Farabi Eye Hospital, تهران, ايران
Abstract :
Purpose: To determine the prevalence of calibration errors in Goldmann applanationtonometers at Farabi Eye Hospital.Methods: This cross-sectional study was performed on all tonometers in use at FarabiEye Hospital. All Haag-Streit Goldmann applanation tonometers were checkedaccording to the manufacturer’s method by two independent observers and by a third observer in case of mismatched results. Calibration errors were classified into 6categories of ±0.5, ±1, ±1.5, ±2, ±2.5 and more than ±2.5 mmHg.Results: Overall, 43 Goldmann tonometers were evaluated. There were 3 (7%), 10(24.3%), 16 (38.3%), 24 (56.9%), 31 (72.1%) and 12 (27.9%) tonometers within calibration errors of ±0.5, ±1, ±1.5, ±2, ±2.5 and more than ±2.5 mmHg respectively.Conclusion: Goldmann tonometers were not within the manufacturer s recommended range (±0.5 mmHg) in 93%, and not within the acceptable range of ±2.5 mmHg in 28%of checked devices. Further study is needed to demonstrate the correlation between calibration errors and clinical errors.
