17
3.2 Measurement
(continued)
Remember to prepare the patient before initiating the
measurement. A patient’s anxiety may delay the
measurement and adversely affect its accuracy.
A single reading can be misleading as the IOP will vary
in response to pulse, respiratory and diurnal
fluctuations. Other factors may affect IOP, such as blinking, eye
squeezing, fluid intake, physical activity, body position, etc. Up
to 4 readings may be required in order to reduce the impact of
these variants to a constant IOP. Keeler recommends using the
average of four readings rather than any individual reading.
The TonoCare software will recognise the readings and give an
audible notification when two consecutive readings are within
1mmHg of each other, indicating that further measurements
may not be required.
3.2.2 Preparing the unit
1. Before lifting the hand unit from the docking station, check
the LED indicator is steady on to ensure full battery capacity.
A full battery will last up to 2 days of intensive use.
Performance will deteriorate over time.
2. Remove the hand unit from the docking station and press the
power on button. The hand unit will enter standby mode if
not used for more than 90 seconds.
3.2.3 Preparing the patient
1. Ensure that the patient is comfortable and in a relaxed
position.
2. Ask the patient to remove their contact lenses or spectacles if
worn and to breathe normally. The patient’s eyes should be
fully open and blinking normally throughout the complete
measurement procedure.
3. In order to reassure the patient, you can demonstrate the
measurement procedure using the Manual trigger button
towards one of the patient’s fingers. Re-set (long press OD/OS)
the device after the demonstration.
Summary of Contents for Tonocare
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