To perform tonometry with the Goldmann applanation tonometer, the patient first receives anesthetic eye drops to numb the surface of the eye. Then, the clinician places a small amount of fluorescein dye on the cornea, which allows the microscope to visualize the contact between the prism and the cornea.
The clinician then adjusts the measuring arm and the control knob to bring the prism into contact with the cornea. The prism is gently pushed against the cornea until a circular area of the cornea is flattened. The force required to applanate the cornea is measured by a strain gauge in the measuring arm. Tonometry Device reading is then used to calculate the IOP.
The Goldmann applanation tonometer is a very accurate and reliable method for measuring IOP, with a typical measurement range of 5 to 50 mmHg. However, there are several factors that can affect the accuracy of the measurement, including corneal thickness, corneal curvature, and corneal rigidity. To compensate for these factors, the tonometer is calibrated using a set of standard values that take into account the properties of the cornea.
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