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7. Measurement procedure
7.3 Preparing the Slit Lamp instrument for
examinations at 10 x magnification
• Before beginning measurement, check that the eyepieces of
Slit Lamp are correctly focused.
• Set the brightness control of the instrument to position 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 the doubling prism with Pantasept fluid at between
0.5% and 3.0% concentration or with a similar disinfectant
solution that is innocuous to organic glass (“plexiglass”).
After cleaning, rinse the doubling prisms in distilled
water and allow to dry. Full instructions on cleaning the prism
is covered earlier in this manual.
• 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 to position 1.
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