This is a hand held instrument that uses air pressure to applanate the cornea. The Pulsair uses a transducer to directly measure the air pressure at the point at which the cornea is flattened. Firing the demo button once will give a value of 30, firing it twice will give a value of 50 if the machine is calibrated. If the readings are higher or lower by the same amount these values can be added or subtracted from the patient’s reading to give accurate results. If the values are not linearly higher or lower than the calibration values, the instrument should not be used prior to being serviced.
Only when the tonometer is at the correct distance and properly aligned with respect to the patient’s cornea, will the image of the corneal reflex fall onto three photodetectors in such a way that more light falls onto the two outer detectors than the central one. At the moment that the instrumen...
The Goldmann applanation tonometer consists of an applanating probe and weight loaded lever system, which is placed on a slit-lamp mount. The end of the probe is brought into contact with the anaesthetised cornea. When contact is made, the clinician views the applanated area (which is made visibl...
This is a hand held version of the Goldmann tonometer. It uses a spring to exert a variable force upon the eye. It can be used with patients supine or erect. Since it lacks the control and security of a slit-lamp, care must be taken to stabilise the instrument to ensure centration without causing...
