It is well-known that the most common and largely used assistive
technology among the visually impaired community is the white cane.
Many technologies have been proposed as alternative assistive
devices to improve the autonomous mobility of people affected by
visual diseases. Nevertheless, whatever is the physical quantity
used by these active assistive technologies - mainly ultrasonic or
optical sensors - they present many limitations and none of them
adequately meets the international guidelines defined for the
electronic travel aids and the specific requests coming from the
visually impaired community. The first chapter of this book aims to
provide an overview of the existing travel aids for people affected
by visual diseases, discussing pros and cons of available
technologies. The aim of the next chapter is to convince the reader
that solutions based on mobile visual aid systems will answer a
critical societal challenge. Chapter Three explores the use of
electromagnetic technology in support of visually impaired athlete
runners. Chapter Four describes the present state of mobile
technologies development taking into consideration the point of
view of visually impaired people. Finally, the goal of the
concluding chapter is to relate how the audio-description has been
produced as a communication accessibility resource.
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