No abstract

In this paper we present a sensor, which is designed for application in a tonometer, an instrument for the measurement of intraocular pressure. The sensor measures diameter and position of a part of the eye globe that is flattened by the tonometer. The sensor principle is based on a change in resistance of four resistor arrays due to contact with a metallized foil, which flattens a part of the eye globe. In spite of some problems with the contact resistance between the resistor contact arrays and the metallized foil, it may be concluded that the positioning sensor can be used to improve existing tonometers.

A new instrument for the measurement of intraocular pressure (IOP) is presented. It consists of a micro-machined silicon sensor, which measures the diameter of a flattened part of the eye globe and simultaneously determines the smallest distance between the centre of the sensor and the contour of this applanation. In the centre of this applanation sensor a micro-mechanical plunger is realised, which transfers the applied pressure to a separate force sensor. Preliminary results show that this sensor may improve the accuracy of Mackay-Marg based electronic tonometers.

In this paper we present a new sensor for the measurement of intraocular pressure. We have applied the indentation principle, in which the eye is indented by exerting a force on it, while the size of the indented area is monitored. To measure the force we have used a commercial force sensor. The sensor to measure the indentation of the eye has been developed in our laboratories. We have performed measurements using an experimental set-up; these show that an accuracy of 90% will be possible if the sensor is designed in the proper way.