Operating The Equipment; Preparing The Patient - Haag-Streit CLEMENT CLARKE OPHTHALMIC Perkins Mk3 Manuel D'instructions

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.
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.
It is recommended that only Haag-Streit original Goldmann prisms or Tonosafe are
used.

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.
6. Operating the Equipment
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
Caution:
It is imperative to read chapter 3. Safety and Regulatory Information, and to observe
can vibrate and may disturb the patient. For this reason, the scale is set to
its precautions before operating the equipment.
read 1 before applying the prism face to the cornea.
Sterilized fluorescein paper strips should always be used, as pathogenic exciters
The Perkins tonometer should be held so that the thumb rests on
thrive well in fluorescein solutions.
the milled wheel ( Fig 2, 8) controlling the spring. The light is
Regular calibration of the Tonometer is advised.
switched on by turning the thumb-wheel until the scale reading
(Fig 5) is just above zero.
Do not use without prism fitted.
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
It is recommended that only Haag-Streit original Goldmann prisms or Tonosafe are
forehead rest is correctly positioned, tighten the locking screw and
used.
the instrument can then be brought towards the patient so that the
Preparing the Patient
6.
1
face of the prism cone comes into contact with the cornea.
1. Both eyes must always be anaesthetized (e.g. 2-3 drops each of an anaesthetic within
It is usually easier to hold the tonometer obliquely with the handle
half a minute) to reduce movements of the lids during examination.
slanted away from the nose (Fig 6). Care should be taken to prevent
the prism touching the eyelid margin.
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.
en
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Fig 5 Fig 5
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