[Physical technical calibration of a new self-tonometer].

The microprocessor-controlled applanation tonometer was calibrated in force measurement and area detection by using weights and silicon calibration pistons. This makes it possible to compare the technical precision of the instrument under standardized conditions and the results of previous clinical examinations. With the instrument in a vertical position, the force measurements meets the official calibration requirement. Force measurements in a horizontal position will follow in order to demonstrate that exact measurements can be taken with the instrument irrespective of position. A suitable method for calibrating the optical sensor by using the silicone pistons for area detection is shown. This method is to be extended by using calibration pistons of different diameters, which are within the permitted calibration tolerances.