Calibration check procedure
A calibration check should be done at the start of every day. Place the footplate of the instrument on the rounded test block (the dummy cornea) provided with the tonometer’s storage case. With the footplate resting on the test block, a correctly calibrated instrument will have a scale reading of zero.
If not, you can calibrate it to zero.
If the needle is to the left of zero, rotate the footplate in a clockwise direction and check again.
If the needle is to the right of the zero position, rotate the footplate in an anti-clockwise direction.
Cleaning
Cleaning of the barrel and the plunger should be done once a day to prevent the plunger from sticking to the barrel.
Remove the plunger and use gauze with alcohol to clean the plunger and tip.
Clean the inside of the barrel with an alcohol-soaked cotton swab and then with a dry cotton swab.
Clean the footplate with gauze and alcohol.
Allow it to dry and then place, disassembled, in its case.
In between patients, the Schiotz tonometer should be disinfected by soaking it in sodium hypochlorite.
