nonprogressive labor

After birth, the bony orbits and eyes grow. If they are not the same size/shape, there can be assymmetries [differences in the two sides of the head].

Simply, dystocia is a misplacement of an eye, usually to high or too low. The brain may have problems in recognizing the difference, especially if it is changing. This can lead to double-vision, amblyopia, or dizziness. Dystocia is usually a birth defect.

Dystocia in adults can be due to tumor or thyroid condition or other things:

Talk with your physician for further information.

I think you mean dystocia that means difficult labor.

Difficult parturition to the point of needing human intervention

Dystocia means difficulty in birth either due to the lamb being malpresented or being too big or the ewe being too small - it can cause bruising to the ewe and could kill her if she doesn't receive veterinary attention.