Electronic Active Model For
Saccadic Eye Movements
Author(s)
O. Terán & E. Suaste
Abstract
The design, development and construction of an electronic active model (EAM)
were proposed. The model was based on the reciprocal innervation mechanical
model for horizontal eye movements and was intended to emulate the
biodynamic rotatory properties of a human eye plant caused by neurologic
activation signals on the lateral and medial extraocular muscles. Biodynamic
properties of the mechanical eye plant, such as viscosity, inertia and elasticity,
were included in the EAM in order to obtain a similar response. Apart from these
features, voltage controlled resistors (VCRs) based on MOSFET to keep the
nonlinearity of the plant were also included. These active elements, together with
passive components, constitute the structure of the extraocular muscles, eyeball
and tissues around the eyeball. The activation of agonist-antagonist signals were
generated by two voltage controlled sources to reproduce the neurological
activity. In this way, applying the appropriate signals to generate saccadic
movements was obtained by a voltage signal proportional to the velocity of the
eye torque. This signal allows one to obtain information relating to acceleration
and position in order to validate the EAM. Due to this capability to emulate
saccadic movements, the EAM makes it possible to reproduce involuntary eye
movements caused by pathologies such as Horizontal Nystagmus. Finally, some
of the EAM’s advantages lie in its response velocity and the ease of obtaining
continuous records for the dynamic eyeball response in a signal that features ease
of recording and application in biomedical areas, and is particularly relevant to
specialists such as Neuro-ophthalmologists, ophthalmologists and optometrist,
and even for medical education.
Keywords: eye plant, electronic model, saccadic eye movements.
Keywords
eye plant, electronic model, saccadic eye movements.
Related Book
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