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Tunnel
Vision Without Prism
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Tunnel
Vision With Prism
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This simulation demonstrates the vision of a patient with tunnel vision
scanning a visual scene without the aid of the tri-field glasses. The
small, central aperture (~5 deg of visual angle) represents the patient's
restricted visual field.
The arrow illustrates the direction of head (eye) movements as the person
scans the scene. Note that for simplicity, the scene is static (i.e. the
people are not moving).
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This simulation demonstrates the vision of a patient with tunnel vision
scanning a visual scene with the aid of the tri-field glasses. The small,
central aperture (~5 deg of visual angle) represents the patient's restricted
visual field.
The arrow illustrates the direction of head movements. Notice the chromatic
fringes on the spatially distorted images created by the prisms.
Also notice the three-fold increase in the visual field by the tri-field
glasses (a central view, a ~5 deg ghost view shifted over from the left
side, and a ~5 deg ghost view shifted over from the right side).
However, the situation depicted here is limited to the case when the eyes
are at a primary gaze position (looking straight ahead) and scanning is
done with head movements.
In the more natural case of eye scanning, when the eyes are at all other
gaze positions, only one of the two additional side views will be visible
(i.e. if the eyes are looking to the right, then only a ghost image shifted
to the right) |
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Tunnel
Vision Combined Video
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This simulation depicts a side-by-side comparison of a tunnel vision condition
without the aid of the tri-field glasses in one and with the aid of the
tri-field glasses in the other.
Upper view: This simulation demonstrates the vision of a patient
with tunnel vision scanning a visual scene without the aid of the tri-field
glasses. The small, central aperture (~5 deg of visual angle) represents
the patient's restricted visual field. The arrow illustrates the direction
of head movements. Note that for simplicity, the scene is static (i.e. the
people are not moving).
Lower view: This simulation demonstrates the vision of a patient
with tunnel vision scanning a visual scene with the aid of the tri-field
glasses. The small, central aperture (~5 deg of visual angle) represents
the patient's restricted visual field. The arrow illustrates the direction
of head movements. Notice the chromatic fringes on the spatially distorted
images created by the prisms.
Also notice the three-fold increase in field of view by the tri-field glasses
(a central view, a ~5 deg ghost view shifted over from the left side, and
a ~5 deg ghost view shifted over from the right side). However, the situation
depicted here is limited to the case when the eyes are at a primary gaze
position (looking straight ahead) and scanning is done with head movements.
In the more natural case of eye scanning when the eyes are at all other
gaze positions, only one of the two additional side views will be visible
(i.e. if the eyes are looking to the right, then only a ghost image shifted
to the right) |
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If you are having
trouble viewing the videos, click
here
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For more information visit the Bioengineering
Research Partnership project page, or refer to the readings below:
Peli, E. (2001). Vision multiplexing - an engineering approach to
vision rehabilitation device development. Optometry and Vision Science,
78: 304-315. [PDF
938 KB]
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