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9. General information and suggestions concerning measurement
IMPORTANT NOTE
Measurement must be performed as quickly as possible on each
eye. Should epithelial drying be observed, we recommend the
patients acuity and visual fields should be examined.
The pressure measurement procedure may be repeated several
times. Nervous or anxious patients often have higher intra ocular
pressure during the first measurement procedure.
It has been found that pressure decreases during the first few
minutes of the procedure, when the patient realises that the
tonometric examination does is not unpleasant. When correctly
anaesthetised and with their eyes fully open, the patient will
feel absolutely nothing. Therefore we recommend running a
preliminary measurement procedure on each eye, the results of
which need not be taken into consideration. After completing the
preliminary procedure, run three measurement procedures on each
eye. These readings will be correct if the pressure has stabilised.
When the measurement procedures are performed correctly, the
results of the subsequent measurements will vary by only about
0,5 mmHg.
When the measurement procedure for one eye is prolonged
excessively, drying phenomena will occur on the corneal epithelium
of both eyes.
A ring of fluorescent deposits will form around the cornea
contact surface and around the measuring prism on the eye
being examined. The other eye will show fluorescent dry areas,
resembling a map, which will hinder and make measurement
unreliable.
The eye will rapidly recover from any corneal dryness without the
need for any treatment, visual acuity may be temporarily affected
by fine epithelial defects.
