Instruction To The Patient - Perkins Mk2 Manuel D'instructions

6. Operating the Equipment
Preparing the Patient
6.
1
When seen through the viewing lens (Fig 2, 7) the semicircles of fluorescein should now
be clearly visible and appear equal in size, denoting that the contact point is central on
the cornea.
The light is switched off by turning the thumb-wheel until the scale reading (Fig 2, 9) is
below zero.
Note: The lighting is designed to give optimum fluorescence only when the prism cone
is at its calibrated position i.e. when the rim of the prism holder is level with, or not
more than 1 mm above the case surface.
6.

Instruction to the Patient

2
Instruct the patient to look straight ahead or slightly upward and if necessary use a fixation
light for this purpose.
It is recommended that patients are repeatedly asked to keep their eyes wide open during
the examination. If required, the lids of the examined eye may be held open by the examiner's
fingers provided that no pressure is applied to the eye.
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Fig 6
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