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Repeatability and reproducibility of TonoCare were assessed by
measuring a manometrically controlled test eye.
Repeatability was measured using a single TonoCare device and
a series of approximately 50 individual readings for each of 5
pressure values spaced evenly between the 5 to 50mmHg
working range. Readings were cross referenced with a reference
pressure meter and a Pulsair IntelliPuff device. Failed readings
were rejected and averages of 3 subsequent readings were
calculated to give a set of approximately 16 measurements at
each of the 5 pressure values. Results demonstrate standard
deviations ranging from 0.14mmHg to 1.11mmHg within the 5
to 50mmHg pressure range respectively.
Reproducibility was assessed by analysing measurements from
three different TonoCare units by two different operators across
5 pressure values spaced evenly between the 5 to 50mmHg
working range. Two measurements (an average of 4 readings) at
the 5 pressure values were taken for each of the six test cases
(each operator using each of the three TonoCare devices).
An Analysis of Variance (ANOVA) conducted on the data
indicates a p-value of less than 0.05 and an R-square value of
98% or 99%, which signifies excellent reproducibility across
operator and across devices.
3.2.5 Repeatability and reproducibility
Summary of Contents for Tonocare
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