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1. If you haven’t done it in the previous step, use the manual
trigger / demo button to dispel any minute particles of dust or
moisture which may have settled whilst the TonoCare was not
in use.
The TonoCare is set to automatically select the right eye
as the first eye to be measured. If you wish to select the
left eye, press the OD/OS button. Ensure you are recording the
measurement for the intended eye.
2. Hold the hand unit with the dominant hand, and position the
device so it is aligned with the patient’s eye from a distance of
about 30 cm or 12 inches.
3. Move the device in towards the patient until the forehead rest is
positioned against their forehead. You may choose to rest your
fingers on the forehead rest to gain more stability.
4. Ask the patient to focus on the green target inside the device.
5. Using your preferred eye, look through the eyepiece so that you
can see the patient’s eye. Keep moving the instrument forward
whilst aligning the positioning ring to the patient’s iris. Centre
the measurement area with the pupil of the patient’s eye and
make note of the reflected LED crescents. These should be
central on the pupil as well.
6. When the device is approximately 15mm (0.5 inches) away
from the patient’s eye, a cross will appear to indicate the
position of the device relative to the eye. Move the device so
that the edges of the cross are just inside the corners of the
measurement brackets*.
The cross must not be larger than the measurement
area, as this would indicate that the device is too
close to the eye.
7. Once the cross reaches the correct alignment position, a
gentle air impulse will trigger an IOP reading. Ensure eyelids
and eyelashes are clear of the measurement brackets to obtain
accurate results.
If no applanation was recorded during the puff, a low
pitch tone will be heard (if sounds are enabled in the menu
setting) and two stars (**) will be shown on the internal display.
8. Ensure an IOP reading has been recorded on the device.
3.2.4 Obtaining a measurement
* Correct position
and size of cross in
measurement area
Summary of Contents for Tonocare
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