There is also an empirical vertical horopter, which is effectively tilted away from the eyes above the fixation point and towards the eyes below the fixation point.
22.
When one fixates on a particular point for even a short period of time, an unchanging stimulus away from the fixation point will fade away and disappear.
23.
Hering's law of equal innervation is best described by M�ller's stimulus where the fixation point changes position in 1 eye but not the other eye.
24.
The vertical meridian runs from above the observer's line of sight, through the fixation point, and to below the observer's line of sight.
25.
When one fixates a point straight ahead on a window, one might see, through transparency, a different object in each eye aligned with the fixation point.
26.
Regular fixation points were not provided for automobiles at that time, so the plates were simply drilled to have two holes and suspended with ropes going through them.
27.
When the head translates, for example during walking, the visual fixation point is maintained by rotating gaze direction in the opposite direction, by an amount that depends on distance.
28.
After the monkeys touched a central cue spot on the screen and looked at a central fixation point ( red ), another cue ( green ) popped up briefly then disappeared.
29.
When both eyes look at the fixation point, the house and the tree will appear superimposed in the cyclopean image, however the perceived location of these two superimposed images will be straight ahead.
30.
Etc etc . If the object and the fixation point are both sufficiently stiff this back and forth movement will go on for quite some time, enough to stabilise in a regular vibration ( frequency ).
