- Stereopsis is a Hyperacuity : Threshold of 6-7 arcsec.
- Limits of Vergence and Panums Fusional Area
- So, binocular disparity is always around vergence.
- With our eye separation, our eyes are essentially parallel at about 20ft.
- We have a limit on stereopsis in Panums Fusional area of 22 arcmin.
- Beyound this we get mostly depth order information from binocular disparity
- So grand expanses do not benefit much from stereopsis.
- Misalignment of Images
- Too Much Disparity
Corrected
While the upper amount of disparity we can see at one time is 22 arcmin, that range is expanded by vergence. Still, in an image, there is an upper limit to what we can handle, particularly in the main image. - Vertical Misalignment
Key: eyes not not like to realign vertically. One of major problems with ealier methods of displaying Stereoscopic movies. - Rotational Errors
Keep images in the same horizontal plane
- Too Much Disparity