Safety Information; Overview - Canon TX-F Operation Manual

1. Overview

The Canon Full Auto Tonometer TX-F is an instrument for measuring intraocular pressure
without making contact with examinee's eye.
Just by displaying the examinee's eye somewhere on the monitor and pressing the START
switch, the TX-F then automatically performs alignment and measurement by a three
dimensional tracking system.
Measurement mode can be selected
The examiner can select a measurement mode from three modes: FULL AUTO, AUTO and
MANUAL.
In FULL AUTO mode, measurement of both eyes will be performed automatically.
Also, the result can be selected to be printed automatically after measuring both eyes.
Thus, full measurement can be done very easily in a short time.
In AUTO mode, alignment and measurement will automatically be performed once each
time the switch is pressed. Thus, you can perform measurement after checking the
START
condition of examinee's eye each time. Also, you can measure the eye as many times as
required.
In MANUAL mode, measurement can be performed manually when examinee's pupil is
eccentric, or when measurement is apt to result in error.
Observation range of examinee's eye on the monitor has been
widened and the depth of focus is deep
It is easier to check the position of the eye or whether eyelashes are covering the pupil.
Level meter will be displayed
The TX-F obtains intraocular pressure from the waveform of the signal obtained by detect-
ing light reflected from the cornea when air is blown onto the eye.
However, when the reflected light is obscured by the eyelid or eyelashes, the waveform of
the signal becomes low, reducing the reliability of the measurement value.
The level of the waveform can be displayed in four steps as a mark ("level meter") on the
measurement mode screen, display mode screen and the printout by the setting in SET
mode. Thus, the level meter can be used to check the reliability of the measured values.
When error has occurred, image will be displayed immediately
on the monitor
This makes it easier to determine the cause of the measurement error.
Also, the eyelid warning line on the warning image will enable you to see if the eyelid or
eyelashes were too low during measurement. If the eyelid or eyelashes are below the line,
help the examinee open the eye wide by gently holding up the upper eyelid with your fin-
gers.
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