Resolution
People suffering from migraine with visual aura most often see their symptoms in the periphery and not at the center of gaze. When they change gaze the visual disturbance is moving with the eye movement, a feature called translocation. Therefore the animation should not be looked at directly.
The distance between the fixation cross and the vertical middle line of the animation should be approximately like shown below: 
Computer monitor displays are between 72-90 dpi depending on the monitor's size and the currently set resolution. Please check the distance in the image above and adjust the distance of your head (eyeballs) to your monitor screen according to the table below.
| Measured Distance |
Monitor Resolution |
Viewing Distance |
| 5.6cm / 2.22inch |
72 (dpi) |
51cm / 22.2inch |
| 4.5cm / 1.77inch |
90 (dpi) |
64cm / 25.2inch |
Back | Test timing
Author: Markus Dahlem
Last modification of this page: Tue. Jan 4 2005
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Pathomechanisms 
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