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J Charlier

Publications and source records attributed to J Charlier.

82 records · Page 5Linked to original sources
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[Differential photo-oculography of vertical and oblique movements].

Up to now EOG has been the only method used to record ocular movements in daily practice. However such a mean has various drawbacks and limits. It has two main gaps: firstly for vertical movements because the interference discharges related with palpebral movements and blinkings; on the other hand for oblique movements because the unequal transmission of EOG potential towards the orbital rim. The differential photo-oculography perfected by Charlier et Buquet has been fitted and now can be easily used in clinical conditions. With this optical method, it exists a direct relation between the gaze direction and video signals of the eye. The authors point out the reliability of its results not only for horizontal movements, but also for vertical and oblique movements. This method allows a relevant analysis of all kinetic parameters whatever the moving axis may be.

Eye Movements↗
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[Analysis of vergence movements using differential photo-oculography].

Analysis of vergence troubles is weight by an heavy handicap. In clinical conditions it is easy to value the static vergence balance with a great lot of tests. On the contrary examination of kinetic vergence pattern is generally neglected. Usually a refixation vergence is a combination of an horizontal convergence-divergence of 5 to 10 degrees with a vertical component of 15 to 20 degrees. It is impossible to do their reliable analysis by kinetic EOG because the unequal transmission of potential towards the orbital rim. The authors give the results obtained by photo-oculographic method perfected by Charlier and Buquet. On all recordings it can be noticed that, in vergence refixation, vertical movements of both eyes are always true congruent saccadic versions, while the horizontal movements are disjunctive, dissociated and unequal. On the vertical axis it seems to be no real kinetic vergence at all, but in some cases only a mere tonic alignment. Such a device is a very good mean to study the vergence troubles in daily practice.

Eye Movements↗