Confocal setting (called parfocality adjusting) is a disposable setting which allow the user to change magnification during treatment without the need of correcting the focus (image remains sharp at any magnification).
Step 1.
Magnification knob set to the minimum value, and the two dioptre oculars rings on 0
Step 2.
Set the head of the microscope over any flat surface at the focal distance of the lens - "f".
f - distance between the lens and treatment field - info regarding your focal distance is printed on your objective lens.
Step 3.
On a clean white sheet of paper with a sharp pencil, draw a cross in the size of 5cm.
Put the sheet on a flat surface so that the cross was in the centered area, illuminated with light from the microscope head.
Step 4.
Look threw the oculars. If the image is not sharp, set it by adjusting the microscope head up / down. You can use the handle located at the head of the microscope.
Step 5.
Magnification knob set to the maximum value.
Step 6.
Set the focus accurately using a micrometer screw in order to get a clean and clear picture of the cross. If necessary, change the position of the microscope head up/down.
Step 7.
Re-adjust the magnification knob to minimum.
Pay attention not to move the head of the microscope.
Step 8.
Adjust the focus using the diopter rings this time.
To do this:
- turn the rings fully to the right,
- look with the left eye threw the left eyepiece, closing the right eye,
- slowly turn the dioptric ring left on the eyepiece to obtain a sharp image.
Repeat the steps for the right eyepiece (closing the left eye).
Step 9.
Check whether changing the magnification to the next, from the smallest to the largest, the picture is clear and sharp each time.
If not, repeat the above steps ( step 1) to obtain a satisfactory result.
Step 10.
The values obtained this way on the diopters rings should be noted for each individual operator.
Before starting work, always check the dioptre setting.