Eccentric fixation is found in some cases of strabismus with deep amblyopia. When present, monocular fixation of the amblyopic eye does not occur along the foveal visual axis but is eccentric to it in a convergent, divergent, or vertical position, depending on the type of squint. In the cases discussed here, the eccentric area of fixation was at the angle of squint and so fixed that no movement of the eyes occurred with the cover test, even though a large squint was present.
According to Duke-Elder,1 these findings mean that an eccentric point on the retina is chosen to take up fixation. They have been called cases of "false macula," or "functional macula," or "paracentral fixation." A perusal of the modern literature on the subject * leaves one with the impression that the amblyopia in these cases cannot be improved with occlusion of the good eye, and that occlusion of
URIST MJ. Eccentric Fixation in Amblyopia Ex Anopsia. AMA Arch Ophthalmol. 1955;54(3):345-350. doi:10.1001/archopht.1955.00930020351003