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3.
Correct measurement
1. Immediately before taking the measurements, the patient
should be made to close the eyes briefly so that the cornea
becomes sufficiently moistened with the lacrimal fluid and
fluorescein.
2. By moving the slit lamp forward, the measuring prism is
brought into contact with the centre of the cornea over the
area above the pupils.
The limbus of the cornea will be illuminated with a bluish hue.
This illumination is best observed by direct sight from the op-
posite side of the illumination unit by the examiner.
As soon as the limbus of the cornea illuminates, cease any
further forward movement of the slit lamp immediately.
3. After obtaining contact, commence observing the cornea
through the microscope. A regular pulsation of the two semi
circular fluorescein rings, which can be of varying size de
-
pendent on the ocular pressure, when the measuring drum
is at setting 1, will show that the tonometer is in the correct
measuring position.
The requisite correction is made with the guide lever until the
applanated surface is observed as two semi circular surfaces
of the same size in the centre of the field of sight (11).
Small lowering adjustments of the slit lamp with the guide lever
have no effect on the size of the semi circular images.
4. The pressure on the eye is increased by turning the measu-
ring drum on the tonometer, until the edges of both fluorescein
rings just meet
= correct position
(12).
The edges cross over each other with the pulsation of the
eye.
The width of the fluorescein ring around the contact position
of the measuring prism should be 1/10 approximately of the
diameter of the applanation surface (0.3 mm).
5. Reading the scale:
• The reading
• multiplied by 10
• gives the ocular pressure in mm Hg
11
12
Hinweis
Die nachfolgenden Illustrationen
sind schematisch vereinfacht!
Remarque Les figures suivantes sont
schématiquement simplifiées.
Notice
The following are schematically
simplified illustrations!
Richtige Einstellung! Position correcte! Correct position!