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© HAAG-STREIT AG, 3098 Koeniz, Switzerland - HS-Doc. No. 1500.7220067.04180 – 18. Edition / 2020 – 01
DEUTSCH
ENGLISH
FRANÇAIS
ITALIANO
ESPAÑOL
NEDERLANDS
PORTUGUÊS
SVENSKA
DEUTSCH
ENGLISH
FRANÇAIS
ITALIANO
ESPAÑOL
NEDERLANDS
PORTUGUÊS
SVENSKA
Fluorescein band too wide (1)
The measuring prism was not dried after cleaning or the eye‑
lids came into contact with the measuring prism during mea‑
surement.
1
The slit lamp must be pulled back and the measuring
prism dried with a lint-free cloth (e.g., made of cellulose).
Fluorescein band too small (2)
The tear fluid has dried up during a prolonged measuring pro
‑
cess.
2
Allow the patient to close his/her eyes a few times and
then repeat the measurement.
5.8.1 Incorrect distance to the patient
No semicircular image, only center line is visible (3)
The measuring prism is not coming into contact with the cor‑
nea! If the patient draws his/her head back slightly, irregular pul‑
sations will be caused because the measuring prism is touching
the eye only intermittently. If the patient pulls back even further,
the fluorescein rings will disappear completely.
3
Instruct the patient to adopt the correct position.
Only parts of both oversize semicircles are visible (4)
If the slit lamp is pushed too far against the patient, or if the
patient moves toward the slit lamp, the sensor arm will push
against a spring stop. The applanation surface is too large.
4
The image does not change when the tonometer knob is
turned. Pull the slit lamp back until the uniform pulsations
of a correspondingly smaller surface show the correct
measuring position and pressure changes immediately
cause applanation surface changes.
5.8.2 Position too far to the right/left
Only part of the upper semicircle (5)
Measuring prism not centered on the eye, eye much too far to
the right.
5
Using the control lever, move the slit lamp to the right.
Whole upper semicircle – part of the lower semicircle (6)
Measuring prism not centered on the eye, eye still too far to
the right.
6
Using the control lever, move the slit lamp to the right.
Whole lower semicircle – part of the upper semicircle (7)
Measuring prism not centered on the eye; eye still too far to
the left.
7
Using the control lever, move the slit lamp to the left.
Only part of the lower semicircle (8)
Measuring prism not centered on the eye; eye much too far to
the left.
8
Using the control lever, move the slit lamp to the left.
Correct setting! (9)
Two semicircles appear exactly in the middle of the eyepiece.
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