Dynamic pupil reacting to incident light dedicated to ocular implants

In this paper we propose an artificial human pupil, which is composed of a dedicated controller and a miniaturized display. The purpose of this system is to overcome the problem of post-prosthesis anisocoria for people with ocular implants, by creating iris diaphragm in the prosthetic eye with photosensitive receptors responding to light so as to work in symmetry with the normal eye. The proposed artificial pupil would acquire ambient light through a photosensor, convert the acquired signal to digital data, transform this data to light intensity and finally control the display accordingly. This system would replace the static iris of a prosthetic eye. Experimental results from developed prototype, and post-layout simulation results from the integrated controller faithfully reproduce the expected performance, which is in the form of a dilating and contracting pupil. The controller is implemented in 0.18 mum CMOS process and has a total area of 1.3 mm².