Premium
The validity of a digital eyelid tonometer (TGDc‐01) and its comparison with Goldmann applanation tonometry – a pilot study
Author(s) -
Lam Andrew K. C,
Lam Chin Hang,
Chan Rufina
Publication year - 2005
Publication title -
ophthalmic and physiological optics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.147
H-Index - 66
eISSN - 1475-1313
pISSN - 0275-5408
DOI - 10.1111/j.1475-1313.2005.00296.x
Subject(s) - eyelid , repeatability , goldmann applanation tonometer , medicine , ophthalmology , medical examiner , significant difference , applanation tonometry , intraocular pressure , optometry , mathematics , poison control , blood pressure , emergency medicine , statistics , human factors and ergonomics , arterial stiffness
Purpose: To determine the intra‐ and inter‐examiner repeatability of a new eyelid tonometer, and its agreement with Goldmann applanation tonometry (GAT). Materials and methods: Forty normal subjects were recruited and their intraocular pressure was measured by two examiners using the eyelid tonometer. Examiner 1 carried out the first set of measurement, followed by examiner 2, and then examiner 1 again. Finally, a third examiner was responsible for GAT measurement. Five readings were obtained from the eyelid tonometer by each examiner each time and were masked, and three readings were obtained from GAT. The mean readings from the eyelid tonometer and GAT were used for analysis. Results: The intra‐examiner repeatability for the eyelid tonometer was better (around ±5 mmHg 95% of the cases) than the inter‐examiner repeatability (around ±8 mmHg 95% of the cases). The mean difference between the eyelid tonometer and GAT was small from examiner 1 (<0.5 mmHg). However, the limits of agreement were greater than the clinically acceptable level of ±3 mmHg. Examiner 2 gave an even greater difference from GAT. Conclusions: Similar to other recent studies, we have found that this eyelid tonometer does not provide good agreement with GAT. Different examiners could position the instrument differently and this eyelid tonometer is suggested for screening purposes only.