Testing Visual Functions in Patients with Visual Prostheses - Artificial Sight: Basic Research, Biomedical Engineering, and Clinical Advances - page 101

Figure 5.3. Example image of the localization test: First the fixation spot appears in
the middle and will stay for the entire test. After a few seconds a wedge-shaped bright
stimulus appears at one of eight directions, in this example on the upper left side.
parameters (size of fixation target, eccentricity of the wedge, brightness, number
of trials, and number of choices) are recorded.
The fourth module tests the ability to detect motion (Figure 5.4). A random
pattern of white and black hexagons is moving in one of eight directions (up,
down, left, right, and oblique); again, the patient has to indicate the direction of
movement. The size of the hexagons, the speed of movement, and contrast of
the checkerboard can be adjusted. The black and white patterns are designed as
hexagons to create a smooth appearance of motion even for oblique directions.
Figure 5.4. Example image of the motion test: random pattern of white and black hexagon
moving to the right.