horror fusionis

hor·ror fu·sio·'nis

simultaneous projection into consciousness of retinal images so different that fusion is impossible.
Synonym(s): macular evasion
[L., dread of intermingling]

horror fusionis

Avoidance of fusion resulting from two retinal images which are so different that they are impossible to fuse. This is often the case in strabismus. Syn. fusion aversion.