Nidek Medical TONOREF II Operator's Manual page 149

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Check if the window is cleaned using a penlight. If not, clean it again with new cleaning
paper.
Apply light with a penlight and change the view angle to check the dirt clearly.
Mire ring part
• When the 61. WINDOW CHECK parameter is set to YES or DAY, the measuring window is
checked whether it is soiled at device start-up.
YES
DAY
• When "CHECK MEASURING WINDOW." is printed, clean the measuring window.
• At device start-up, do not stand or put objects in front of the measuring window.
If something blocks the front of the measuring window within the range of 1 m, the measuring win-
dow may not be checked correctly.
Measuring window
The measuring window is checked at every start-up.
The measuring window is checked at the first start-up of the day.
MAINTENANCE Cleaning
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