The Applanation Tonometer is still the most widely used instruments to measure interocular pressure. The advan-tage of the "Goldmann" method are considerable. The measurement can be carried out on the patient sitting at the slit lamp in conjunction with other routine microscopic examinations. The accuracy of the measurement is ex-tremely high. The average deviation in any one single examination does not exceed +/- 0.5. mm HG. Furthermore, repeated measuring procedures do not reduce the ocular pressure, as no massing effects occurs. Last but not least, there are no standardization or calibration difficulties.

Special Features

The measurement of the ocular pressure is carried out on the patient sitting at the slit lamp in conjunction with other routine microscopic examinations.

High accuracy of the measurement - the average deviation in any one single examination does not exceed ± 0.5 mm Hg.

The intraocular pressure in mm Hg is found by multiplying the drum reading by ten. Scleral-rigidity is not to be taken into account as the small volumetric displacement of 0.56 mm3 increases the intraocular tension by about 2.5 % only.

Repeated measuring procedures do not reduce the ocular pressure, as no massaging effect occurs.

There are no standardisation and calibration difficulties.