Zeiss AT 030, Product Documentation Set

Page: 54 / 88

8 Troubleshooting Instruction for use
AT 030 ​
48 / 60 319300-9120-000-GA-GB-240320
Fault Eyepiece
image Remedy
Fluorescein ring too small:
The tear fluid has dried up during
a longer measurement. In this case
the pressure reading will be too
low. Let the patient blink
and close his/her
eyes several times
and repeat the
measurement.
Incorrect distance to patient
No semicircles visible, only the
separating line:
The measuring prism does not
touch the cornea! If the patient
withdraws his/her head slightly,
there will be irregular pulsations as
the measuring prism touches the
eye only intermittently. If the
patient withdraws further, the
fluorescein semicircles will
disappear completely. Instruct the patient
to press his/her
head firmly against
the chin- and head
rest.
Only parts of the two semicircles
are visible as they are too large:
If the slit lamp is pushed too far
towards the patient or if the
patient moves towards the slit
lamp, the measuring arm hits
against a damping spring. The
applanation area is too large.
Turning the measuring drum does
not change the image. Retract the slit lamp
until the uniform
pulsations of a
correspondingly
smaller area show
the correct
measuring position
and pressure
changes lead
directly to surface
changes.
Position too far right/left
Only part of the upper semicircle
visible:
The measuring prism is not
centered with the eye. The eye is
too far right. Move the slit lamp
to the right using
the control lever.
Whole upper semicircle and part of
lower semicircle visible:
The measuring prism is not
centered with the eye. The eye is
too far right. Move the slit lamp
to the right using
the control lever.
Only part of the lower semicircle
visible:
The measuring prism is not
centered with the eye. The eye is
too far left. Move the slit lamp
to the left using the
control lever.