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Horror fusionis
In ophthalmology, horror fusionis is a condition in which the eyes have an unsteady deviation, with the extraocular muscles performing spasm-like movements that continuously shift the eyes away from the position in which they would be directed to the same point in space, giving rise to diplopia. Even when the double vision images are made to nearly overlap using optical means such as prisms, the irregular movements prevent binocular fusion. The name ''horror fusionis'' (Latin phrase literally meaning "fear of fusion") arises from the notion that the brain is, or at least appears to be, actively preventing binocular fusion.
The condition is an extreme type of binocular fusion deficiency.〔
== History ==
In 1935, ophthalmologist Alfred Bielschowsky coined the term ''horror fusionis'' for this condition. In his case description, the condition was present years after surgerical correction of strabismus acquired during childhood and co-existed with aniseikonia. Subsequently, spectacles for size correction ("iseikonic correction") allowed binocular fusion with depth perception to be achieved. Bielschowsky took note that the condition reappeared whenever the spectacles were not worn.〔 ((abstract ))〕〔 ((full text ))〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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