<unk>  is diagnosed using a synoptophore: an image swept across the retina of the nonfixing eye at constant speed is perceived to change its speed in a specific way and then to "jump over" the fixation target. The specification of<unk>  is usually distinguished from a more general condition called central fusion disruption syndrome, where the patient is unable to fuse or to suppress.
Horror fusionis
Robin's Wish
Labial fusion
Liber pantegni
UroVysion
Autoschizis
Tooth fusion
Basilar invagination