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8. Measurement procedure
8.3 Preparing the Slit Lamp instrument for
examinations at 10x magnification
• Before beginning measurement, check that the eyepieces of
Slit Lamp are correctly focused.
• Set the brightness control of the instrument to a position of a
low intensity.
• Set the illumination angle of the Slit Lamp to be
approximately 60° to minimise unwanted reflections.
• Insert the blue filter on the slit lamp beam path and fully
open the slit diaphragm.
Clean and disinfect prism as described in section 4 of this
document.
• Place the doubling prism on into the holder and align the
‘zero mark’ with the white alignment line on the prism
holder, this ensures the mires have a horizontal split.
• Insert the measurement arm so that the measurement head
and microscope optics axes are convergent.
• Rotate the measurement drum until 10.0 is displayed on
the LED.
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