Abstract
In recent years, PC screens have become wider and larger. The nature of our visual field is that visual acuity is at
its highest when someone is looking at the center of something, making the central part look the clearest. Thus, it is
inferred that the size of the area that cannot be clearly seen will increase as screens become wider and larger. For this
research, we prepared a 27-inch wide PC screen and a 19-inch standard screen, and then presented a task involving
calculations as the main work in the center of the screen; furthermore, we prepared a secondary task to test reaction
by having subjects respond to circular figures randomly displayed on the edge of the screen. Then, we investigated
to what degree subjects were able to acquire graphical information displayed on the edge of the screen while they
were focused on the center of the screen. The results showed that between the wide screen and the standard screen,
there were no differences in the rate of correct answers for the calculation task displayed in the center of the screen;
however, their reaction time on the right side (upper right, center right, lower center) of the screen was longer when
they used the wide screen.
