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NOTE!
A smooth operation can only be guaranteed with the use of original
HAAG‑STREIT measuring prisms and Tonosafe.
1. Anaesthetise each eye
2. Apply Fluorescein into the eye to be examined
3. The correct eye height of the patient can be set via the chin rest.
5.4 Patient instructions
1. Press the head firmly against the chin and forehead rests.
2. The patient must look straight forward. If necessary, the small fixing light can be
used to steady the eyes.
3. It is recommended that the patient be repeatedly reminded to keep his eyes
open wide during the examination. It might be necessary for the examiner to
keep the eye open by splaying the eyelids with thumb and index finger.
4. This must be done without applying any pressure to the eye.
5.5 Preparation of slit lamp and tonometer
For all HAAG-STREIT slit lamps and tonometers
1. Before the examination, the eyepieces must be adjusted correctly to the exam‑
iner.
2. Set the magnification to 10x.
3. Adjust the illumination to medium intensity.
4. Position the blue filter in the beam path of the slit lamp's illumination apparatus
and open the slit diaphragm fully.
5. Insert the disinfected measuring prism into the (0° position) holder on the sensor
arm. For Tonosafe, see the separate instructions for use.
6. Snap the sensor arm into place so that the axes of the measuring prism and of
the microscope align.
7. Set the measuring drum to the first calibration line.
AT 900 model R and AT 900 model BQ
1. Swing the illumination apparatus to the left.
2. Release the tonometer from the dwell position to the right of the microscope,
and swing it forward until it locks in the measuring position.
3. From the left, bring the illumination apparatus into contact with the tonometer
bearer arm. This is the only illumination position in which both the patient's left
and right eyes can be easily examined (no 60° position). This arrangement facili‑
tates the splaying of the patient's eyelids, should this be necessary for measure‑
ment. The illumination of the applanated surface through the measuring prism is
practically reflection-free.
© HAAG‑STREIT AG, 3098 Koeniz, Switzerland – HS‑Doc. no. 1500.7006000.04240 – 24. Edition / 2018 – 04
01-IFU_AT900-7006000-04240_eng.indd 9
SVENSKA
NEDERLANDS
PORTUGUÊS
ESPAÑOL
ITALIANO
Observation:
with AT 900 model R in the left eyepiece
with AT 900 model BQ in the right eyepiece
AT 900 model T
1. For an examination through the tonometer's left or right eyepiece, the angle
between the illumination instrument and the microscope should be approx. 60°
so that the image is bright and reflection-free. Alternatively: lighting through the
measuring prism at approx. 10°.
AT 870
1. Swing the sensor arm with the measuring prism into the beam path of the micro‑
scope and the illumination.
2. The angle between the illumination equipment and the microscope should be
approximately 60° so that the image appears bright and free of reflections. Alter‑
natively: lighting through the measuring prism at approx. 10°.
3. Set the measuring drum to the first calibration line.
4. Set a mid‑level illumination intensity.
5.6 Measuring correctly
1. Immediately before taking measurements, the patient should close his eyes
briefly so that the cornea becomes sufficiently moistened with fluorescein-im‑
pregnated tear fluid.
2. By moving the slit lamp, the measuring prism comes into contact with the centre
of the cornea over the pupillary area.
3. During contact, the cornea's limbus takes on a bluish glow. This glow can be
best observed with the naked eye from the opposite side of the illumination ap‑
paratus.
4. When the limbus glows, stop moving the slit lamp immediately.
5. After contact is made, viewing is conducted through the microscope. The uni‑
form pulsation of the two semi circular fluorescein bands, which could be of dif‑
ferent sizes in drum setting 1 depending upon inter‑ocular pressure, shows that
the tonometer is in the right measuring position.
6. Any necessary corrections are done using the slit lamp control lever, until the
flattened surface is observed in the form of two semicircles of similar size in the
middle of the visual field (A).
7. Smaller changes in the depth of the slit lamp using the control lever do not affect
the size of the semicircles.
8. The pressure on the eye is increased by turning the tonometer measuring drum
until the inner borders of both fluorescein bands just touch = correct setting (B).
9. When the eye pulsates, both semi circles cross over each other.
10. The width of the fluorescein band around the contact point of the measuring
FRANÇAIS
DEUTSCH
ENGLISH
03.05.2018 10:11:13
9
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