Canon TX-20 Full Auto Tonometer 手册

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3NamesofParts

This screen shows measurements. 

6

5

4

3

2

1

8

9

10

7

1 

Intraocular pressure 

 : Shows measurements from highest to 

lowest reliability in order 1 to 10. (Measurement 
number: Up to 10) 

 : Shows measurements from newest to 

oldest in order 1 to 10. (Measurement number: Up 
to 10) 

2 

Eye being measured 

R: Right eye 

L: Left eye 

3 

Level of received light 

Indicates the amount of light received from light 
reflected from cornea when measuring intraocular 
pressure. The number of lines increases as the 
amount of received light increases. 

If there is little received light, light reflected from 
the cornea may be obstructed by the eyelid or 
eyelashes. However, it is also affected by the 
corneal reflectivity of the patient. 

4 

Low reliability 

This mark appears when the analysis of the results 
or reliability of the measurement is considered 
low. Measured values that have this mark are not 
included in the standard value calculation. 

5  

Intraocular pressure standard value 

Representative intraocular pressure value that was 
statistically derived from measured values. Measured 
values with a low reliability mark are not used. 

6 

External device connection status 

Shows the status of external device connection. 

 : USB device is connected 

 : Error has occurred in USB device connection

 : LAN is connected 

 : RS-232C device is connected 

No display: No connection 

7 

ID key 

Press to switch to the PATIENTID screen. 

8 

MEASURE key 

Press to switch to the Measurement screen. 

9 

MENU key 

Press to switch to the MENU screen. 

10  DELETE key 

Press to clear all the measurements. 

The measurement values are deleted from the 
instrument’s memory. 

L-IE-5191C_TX-20.indb   28

2013/07/18   13:10:21