Canon TX-20 Full Auto Tonometer - Manual (Page 45)

4BasicOperation
45
Toadjusttheangleoftheoperationleverwithoutmovingthemeasurementunit
Press the alignment off button while adjusting the angle of the operation lever. While the button is
pressed, the measurement unit does not move even if the operation lever is tilted.
2
Have the patient stare at the eye fixation lamp.
Ask patients if the green internal eye fixation lamp can be seen and instruct them as follows:
• Have them blink several times before measurement.
• Have them open their eyes very wide during measurement.
Help them to keep their eyelid open if the movement is difficult for them. Be careful not to apply
pressure to the eyeball while holding the eyelid open. It is not possible to do measurements if there
is pressure on the eyeball.
• Have them not blink during measurement.
• Have them stare at the eye fixation lamp.
Switch to the external eye fixation lamp if it is difficult to see the internal eye fixation lamp or if the
patient’s line of sight is unsteady (see page 43).
3
Press the measurement button.
1) The measurement unit moves automatically to align with the position of the patient's eye.
Tostopmeasurement
• Press any button on the operation panel.
• Press any soft key on the monitor panel.
• Press the measurement button or the alignment off button.
• Tilt the operation lever.
• Rotate the measurement unit vertical movement ring.
Todoameasurementbeforealignmentisfinished
• Press the measurement button.
Press the measurement button when the corneal light point can be seen clearly. You can do
measurements even during auto-alignment.
However, the positioning alignment may not be accurate. Note that the measurement may not be
accurate when measuring this way.
L-IE-5191C_TX-20.indb 45 2013/07/18 13:10:28