Eye and Vision

Internuclear Ophthalmoplegia

The nerve fibres that allow for side-to-side eye movement in flat environments are eviscerated in internuclear palsy. These strands connect concentrations of nerve cells (focuses or cores) that start from the third nervus (oculomotor nerve), the fourth nervus (trochlear nerve), and ultimately the sixth nervus (abduces nerve). Vertical eye development is fully unaffected, whereas level eye development is hampered. The affected eye will turn outward but not inside. The affected eye, which had to flip internally, cannot go past the plane at the goal once someone looks to the side opposite the influenced eye. That is, the directed forward-looking eye appearance.