Question

[andrewschorfield123]

Correct me if I’m wrong, but I think that if you expand the palate, it can lead to a wider interorbital distance the space between the eyes. Usually, in humans, the interorbital distance roughly equals the palpebral fissure length, which is the horizontal length of the eye opening from outer to medial canthus.
When the palate widens, the whole midface structure can become wider, including the distance between the eyes. And if the interpupillary distance increases, the PFL also increases (on medial canthus side, which leads to longer medial canthus) because they are proportionally connected. The pupil sits roughly in the center of the visible eye. So, your IPD is made up of half of one eye width, plus the interorbital distance, plus half of the other eye width.
So, logically, if you expand the face (for example, through palate expansion), the IPD becomes wider, and proportionally, the PFL increases as well (again, on medial canthus side

 

[Sebaandrew]

There are surgical procedures such as box osteotomy or facial bipartition to correct the position of the orbital bones, out of that the extension of a narrow palate isnt going to do something perceptible to the eye to eye distance, maybe move it a millimeter, maybe 1.1 millimeters, but thats just to small, yes the bones are connected, but by insertions, not by bone itself, so a palate expansion is more likely to impact on youre jaw (that it is the majority of cases) and if it is THAT narrow, maybe youre zygos too

 

[slaters]

The difference would be tiny