BlindAid: Virtual Maps For The Blind

Medical News Today
11 Sep 2009

The blind and visually impaired often rely on others to provide cues and
information on navigating through their environments. The problem with this
method is that it doesn’t give them the tools to venture out on their own,
says Dr. Orly Lahav of Tel Aviv University’s School of Education and Porter
School for Environmental Studies.

To give navigational “sight” to the blind, Dr. Lahav has invented a new
software tool to help the blind navigate through unfamiliar places. It is
connected to an existing joystick, a 3-D haptic device, that interfaces
with the user through the sense of touch. People can feel tension beneath
their fingertips as a physical sensation through the joystick as they
navigate around a virtual environment which they cannot see, only feel: the
joystick stiffens when the user meets a virtual wall or barrier.

The software can also be programmed to emit sounds – a cappuccino machine
firing up in a virtual café, or phones ringing when the explorer walks by a
reception desk.

Exploring 3D virtual worlds based on maps of real-world environments, the
blind are able to “feel out” streets, sidewalks and hallways with the
joystick as they move the cursor like a white cane on the computer screen
that they will never see.

Before going out alone, the new solution gives
them the control, confidence and ability to explore new streets making
unknown spaces familiar. It allows people who can’t see to make mental maps
in their mind.

Dr. Lahav’s software takes physical information from our world and
digitizes it for transfer to a computer, with which the user interacts
using a mechanical device. Her hope is that the blind will be able to
explore the virtual environment of a new neighborhood in the comfort of
their homes before venturing out into the real world.

A Touchy-Feely Virtual White Stick

“This tool lets the blind ‘touch’ and ‘hear’ virtual objects and deepens
their sense of space, distance and perspective,” says Dr. Lahav. “They can
‘feel’ intersections, buildings, paths, and obstacles with the joystick,
and even navigate inside a shopping mall or a museum like the Louvre in a
virtual environment before they go out to explore on their own.”

The tool transmits textures to the fingers and can distinguish among
surfaces like tiled floors, asphalt, sidewalks and grass. In theory, any
unknown space, indoors or out, can be virtually pre-explored, says Dr.
Lahav. The territory just needs to be mapped first – and with existing
applications like GIS (geography information system), the information is
already there.

A New Road to Independence

The tool, called the BlindAid, was recently unveiled at the “Virtual
Rehabilitation 2009 International Conference,” where Dr. Lahav demonstrated
case studies of people using the tool at the Carroll Center for the Blind,
a rehabilitation center in Newton, Massachusetts. There, a partially blind
woman first explored the virtual environment of the center – as well as the
campus and 10 other sites, including a four-story building. After just
three or four sessions, the woman was able to effectively navigate and
explore real-world target sites wearing a blindfold.
The virtual system becomes a computerized “white cane” for the blind, says
Dr. Lahav. “They get feedback from the device that lets them build a
cognitive map, which they later apply in the real world. It’s like a
high-tech walking cane,” she says. “Our tool lets people ‘see’ their
environment in advance so they can walk in it for real at a later time.”

Today the blind and visually impaired are very limited in their movements,
which necessarily influences their quality of life. This solution could
help them find new options, like closer routes from train or bus stations
to the safety of home. “Ultimately, it helps the blind determine their own
paths and gives them the ability to take control of their lives,” says Dr.
Lahav, who first began this research at Tel Aviv University, under Prof.
David Mioduser, where she now works. She then further developed it with her
MIT colleagues Dr. Mandayam Srinivasan and Dr. David W. Schloerb.

American Friends of Tel Aviv University supports Israel’s leading and most
comprehensive center of higher learning. In independent rankings, TAU’s
innovations and discoveries are cited more often by the global scientific
community than all but 20 other universities worldwide.

Internationally recognized for the scope and groundbreaking nature of its
research programs, Tel Aviv University consistently produces work with
profound implications for the future.


George Hunka
American Friends of Tel Aviv University

Reproduced from