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8. Measurement procedure
8.2 Preparing the patient
• Use an appropriate topical anaesthetic to numb the cornea.
• Place a strip of fluorescein-soaked paper near the outer
canthus in the lower conjunctival sac. After a few seconds the
lacrimal fluid will be coloured and the paper may be removed.
When using drops, we recommend a 0.5% solution of
fluorescein sodium. If using a 1% or 2% solution, use a glass
rod to introduce a small quantity of liquid into the
conjunctival sac.
• Seat the patient at the Slit Lamp and place his / her chin on
the chinrest and ensure the forehead touches the forehead rest.
• Adjust the chinrest height so that the patients eye is at the
correct height (most Slit lamps have a marker on the chinrest
pole for correct height adjustment).
Reusable prisms are not disinfected prior to shipping and must
be cleaned before their first use as described in section 4 of this
document.
Check prisms for damage prior to use.
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