Rudolf Riester The familar way Operating Instructions

➔

Gebrauchsanweisung
Operating Instructions

schiötz

Rudolf Riester GmbH & Co. KG

P. O. Box 35 • DE-72417 Jungingen
Germany
Tel.: [phone]
Fax: [phone]
[e-mail] • www.riester.de

Printed in Germany. Subject to alterations

900034 Rev. A

Directions for use of the

schiötz Tonometer

You have purchased a high quality schiötz
eye tonometer manufactured in accordance
with the specifications of Directive 93/42EEC
and the Medical Products Act.

1. Intended purpose

The eye tonometer is designed for measuring
the intraocular pressure.

2. Assembly and start-up (Fig.)

Insert the plunger (1) in the footplate (2).
Screw the 5,5 g weight (3) onto the plunger. If
necessary, insert the 7,5 g or 10 g weight (4)
in the direction of the arrow.

3. Information on the use of the device

The supplied conversion table 1955 is the
product of research by Friedenwald, Kronfeld,
Ballantine and Trotter. The pressure of a
healthy eye is approx. 16 mm Hg (average
value).
A tension of 22 (po,interdeflection 3,5 with
5,5 g weight) is very probably too high, while a
tension of 24,5 mmHg (pointer deflection 2 to
3,5 with 5,5 weight) is definitely too high. The
values from the tonometer table 1955 for
measurements with the 5,5 g and 10 g
weights should not differ from each other by
more than 3 mmHg for the same eye. If such
comparative measurements produce"
significant variations repeatedly, the rigidity of
the cornea is abnormal. If values more than 3
mmHg higher are obtained using the 10 g
weight table than with the 5,5 g weight table,
the rigidity is too high, and the actual intraocu­lar pressure is lower than that indicated by
the tonometer. Conversely, if the mmHg value
is lower with the 10 g weight than the 5,5 g

weight, the rigidity is too low; in such cases,
the actual intraocular pressure is higher than
that measured with the tonometer. In patients
with abnormal rigidity, the pressure measured
with the 5,5 g tonometer weight comes
closest to the actual pressure value, as the
calibration values for the 5,5 g tonometer
weight are less influenced by abnormal
corneal rigidity. In the critical pressure ranges
from 20 to 30 mmHg, we recommend
measurement with the 5,5 g tonometer
weight.

4. Preparations for pressure measurement

After each pressure measurement, remove
the plunger and clean it with alcohol ether.'
Immediately before the pressure
measurement, reassemble and clean the
tonometer, then place it on the test block (5).
The pointer must be set to zero; deviations of
max. 0,2 of a scale division are permissible.
The patient schould be in a recumbent
position for the intraocular pressure"
measurement. After anaesthetising the cornea
with an ordinary anaesthetic, place the
tonometer in a vertical position at the centre
of the cornea. Do not exert any pressure on
the eyeball when moving back the lids.
Reliable pressure values can only be read off
when the pointer shows a pulse.

5. Metrological inspection ,

The metrological inspection can only be
performed by the manufacturer or an
authorized body. According to the Medical
Product Operators ordinance of 29 June
1998, metrological inspections should be
carried out at intervals of 2 years.

6. Technical data

Scale: 0 to 20 scale divisions

o to -1 scale division
1 scale division corresponds to a stroke of
0,05 mm.

The tonometer should be stored in a closed
container (case).

Please note that the product described in the
operating instructions is intended exclusively
for use by suitably trained personnel.

7. Cleaning

After use, remove the 5,5 g weight by
unscrewing it from the plunger thread and
withdraw the plunger from the tube. Place
the plunger, the 5,5 g weight and the other
weights (if using) in a non-alkaline
cleaning solution (see manufacturer's
directions for preparation of solution and
soaking time). Rinse out the footplate
cavity thoroughly with warm distilled water
in order to dissolve any salt crystals from
the tear fluid. After cleaning, rinse off any
residues of the cleaning solution
thoroughly with demineralised or distilled
water.

8. Disinfection

The tonometer can be disinfected with
70% alcohol.

9. Care and inspection

Always inspect ,the plunger and footplate
for nicks or scratches prior to sterilisation
and eliminate these without delay before
reusing.

10. Sterilisation

Place the tonometer in transparent aseptic
packaging or a suitable aseptic container.
Sterilise for 3 min. in a steam autoclave
under forepressure at 134°C. The
effectiveness of this process has been
validated for the tonometer.

Umrechnungstabelle 1955

Zeiger-

Ausschlag

Scala Reading

Augendruck - Pressure, mmHg

Tonometerstiftgewicht - Plunger Load

5,5 g 7,5 g 10,0 g 15,0 g
0,0 41,5 59,1 81,7 127,5
0,5 37,8 54,2 75,1 117,9
1,0 34,5 49,8 69,3 109,3
1,5 31,6 45,8 64,0 101,4
2,0 29,0 42,5 59,1 94,3
2,5 26,6 38,3 54,7 88,0
3,0 24,4 35,8 50,6 81,8
3,4 22,4 33,0 46,9 76,2
4,0 20,6 30,4 43,4 71,0
4,5 18,9 28,0 40,2 66,2
5,0 17,3 25,8 37,2 61,8
5,5 15,9 23,8 34,4 57,6
6,0 14,6 21,9 31,8 53,6
6,5 13,4 20,1 29,4 49,9
7,0 12,2 18,5 27,2 46,5
7,5 11,2 17,0 25,1 43,2
8,0 10,2 15,6 23,1 40,2
8,5 9,4 14,3 21,3 38,1
9,0 8,5 13,1 19,6 34,6
9,5 7,8 12,0 18,0 32,0

10,0 7,1 10,9 16,5 29,6
10,5 6,5 10,0 15,1 27,4
11,0 5,9 9,0 13,8 25,3
11,5 5,3 8,3 12,6 23,3
12,0 4,9 7,5 11,5 21,4
12,5 4,4 6,8 10,5 19,7
13,0 4,0 6,2 9,5 18,1
13,5 5,6 8,6 16,5
14,0 5,0 7,8 15,1
14,5 4,5 7,1 13,7
15,0 4,0 6,4 12,6
15,5 5,8 11,4
16,0 5,2 10,4
16,5 4,7 9,4
17,0 4,2 8,5
17,5 7,7
18,0 6,9
18,5 6,2
19,0 5,6
19,5 4,9
20,0 4,5