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First Author: M.Win MALAYSIA
Co Author(s): T. Lai Yong N. Choung Min V. Subrayan
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To assess the intra-observer repeatability and inter-observer reproducibility of central corneal thickness measurements using Accutome Pachpen handheld ultrasonic pachymeter by different personnels.
Ophthalmology clinic, University Malaya Medical Center, Kuala Lumpur, Malaysia
In this prospective study, central corneal thickness ( CCT ) was measured in 184 eyes of 92 healthy subjects, first by a senior ophthalmology trainee ( observer 1 ) then by an ophthalmic nurse ( observer 2 ). Nine measurements were obtained from each eye by each observer independently. Each observer received standard training in using the pachymeter before the study was initiated. Measurements were compared between the observers. Coefficients of repeatability and reproducibility were calculated. The Bland-Altman plot was used to assess agreement between observers.
Mean age of the study population was 54.3 +/-15.2 years old and consisted of 43.5% male. Mean CCT as measured by observer 1 and 2 were 528.3 +/- 32.9 um and 530.7 +/- 33.3 um respectively. Although measurements by observer 1 showed higher repeatability compared to that of observer 2 ( coefficient of repeatability 3.46 % Vs 5.55% ), there was no significant difference in the mean and standard deviation of the measurements between observers. Their measurements showed high correlation ( 0.96 ) and good agreement ( mean difference -2.4 um; 95% limits of agreement -21.4, 16.7 um). Coefficient of reproducibility was 5.08%.
Pachpen provided excellent intra-observer repeatability and inter-observer reproducibility for measuring CCT regardless of background medical training.