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J R Charlier

Publications and source records attributed to J R Charlier.

6 recordsLinked to original sources
PubMed1998

Clinical and functional evaluation of a gaze controlled system for the severely handicapped.

This preliminary study evaluates the suitability of a gaze controlled communication system for severely handicapped patients. The system drives a computer by movements of the patient's pupils. The capacity to communicate by producing text on a screen was assessed in 30 patients, 22 traumatic tetraplegics and 8 patients whose handicaps were due to other causes. The rate at which they learned to use the system, and the speed of their word processing were measured. Those tetraplegics who had used other communication systems found the gaze controlled system tiring, and its lack of other peripherals limiting. But its true application seems to be as the sole available interface for the most severely handicapped who can neither move nor speak. Peripherals and improved calibration systems are presently being developed.

Activities of Daily Living↗
PubMed1994

Quantitative assessment of the static properties of the oculo-motor system by the photo-oculographic technique.

The paper addresses the problems raised by the application of the photo-oculographic technique to the quantification of static orientations of the eye in ophthalmology. Eye orientations are determined from the relative positions of corneal reflex and pupil images. The relationship between the positions of these images and the angular rotations of the eye is studied with an optical model of the anterior chamber of the eye. This model is used to analyse the influence of technical and physiological variables and to evaluate the accuracy of different calibration procedures applicable to clinics.

Adult↗
PubMed1992

[Eye controlled microscope used in ophthalmic microsurgery].

This article presents a system of oculomotor control of the microscope used in ophthalmic microsurgery. An eye movement sensor has been integrated within the microscope lens. The information provided by this sensor is used to control the position of the microscope with no alteration of the surgeon's visual functions and no interference with his visual sensori-motor reflexes. Results have been obtained from laboratory experimentations as well as from a series of anterior and posterior segment surgical procedures. They demonstrate the high precision and sensitivity of the gaze control which can be used to compensate for the reduction of the field of vision resulting from the optical magnification of the microscope.

Eye Movements↗