Intraocular Pressure Measuring System Based on Piezoelectric Bimorph

Abstract

Based on a method of measuring intraocular pressure by the effect of piezoelectric bimorphs, a testing system for intraocular pressure is proposed. In this paper, we discuss the measuring principle, the measuring circuit; Pig eye is used as the research object, and a relationship between the output current of bimorph and the internal pressure of eyeball is established through experiment. The experimental result shows that the internal pressure of eyeball and the output current of intraocular bimorph have relatively good linear relationship within the range of human intraocular pressure, the linear relationship expression between intraocular pressure and current can be attained by using linear fitting method. The fitting function expression is used as calculation basis, the known intraocular pressure of simulation eyeball is measured, and measurement results show that the error is relatively small, which proves that this method is practical and feasible in a certain extent.