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Cross eyed to parallel

Started Apr 21, 2016 | Discussions thread
Turbguy1
MOD Turbguy1 Senior Member • Posts: 1,467
Re: Cross eyed to parallel
1

Many of us post crosseye here (and elsewhere) to permit "freeviewing" of a pair (no viewer aid required).

A significant portion of the population can freeview crosseye with a small amount of practice, and there is no practical limit to image size when freeviewing in that manner.  Normal vision requires crosseye control to converge on close objects.  The practice requires getting skillful at "decoupling" convergence and focus.   Once you accomplish this, it's like riding a bicycle, you don't forget how.

Freeviewing parallel is constrained by image separation not much larger than 2.5", or 65mm, otherwise vision has to diverge, which is NEVER done in normal vision and is quite uncomfortable, or even painful, for a huge percentage of the population.

The separation restriction limits the size of a parallel stereo pair capable of being freeviewed.

That said, it is possible to withstand and accommodate larger parallel separations with practice, but it can be very distressing at first. And it does not get easier with increasingly wider separations

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