This model of the Haag-Streit Goldmann applanation tonometer is designed for the BC 900 and BD 900 slit lamps. It mounts onto the microscope and can be swiveled into position when required.
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.
The instrument stays permanently mounted to the slit lamp and is swung into place when IOP readings are required.