Operating The Equipment; Preparing The Patient - Perkins Mk2 Manuel D'instructions

en
6.

Operating the Equipment

Caution
It is imperative to read chapter 3. Safety and Regulatory Information, and to observe
its precautions before operating the equipment.
Perfect functioning can only be guaranteed with the use of an original HAAG-
STREIT prism or Tonosafe.
Sterilized fluorescein paper strips should always be used, as pathogenic exciters
thrive well in fluorescein solutions.
Regular calibration of the Tonometer is advised.
Do not use without prism fitted.

Preparing the Patient

6.
1
1. Both eyes must always be anaesthetized (e.g. 2-3 drops each of an anaesthetic within
half a minute) to reduce movements of the lids during examination.
2. Place a fluorescein paper strip near the external canthus in the lower conjunctival sac.
After a few seconds the lacrimal fluid is sufficiently coloured and the paper can be
removed.
Alternatively combined anaesthetic fluorescein eye drops can be used.
When using drops, a solution of sodium fluorescein 0.25% to 0.5% is advisable.
Caution:
If the prism touches the cornea without any force applied, the pressure arm
can vibrate and may disturb the patient. For this reason, the scale is set to
read 1 before applying the prism face to the cornea.
The Perkins tonometer should be held so that the thumb rests on the milled wheel
( Fig 2, 8) controlling the spring.
If the forehead rest (Fig 1, 1) is to be used, the stem (Fig 1, 3), should be extended after
loosening the locking screw (Fig 1, 2). When the forehead rest is correctly positioned, tighten
the locking screw and the instrument can then be brought towards the patient so that the
face of the prism cone comes into contact with the cornea.
It is usually easier to hold the tonometer obliquely with the handle slanted away from the nose
(Fig 6). Care should be taken to prevent the prism touching the eyelid margin.
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