健眼の外傷後に弱視眼の視力が改善した1例

Improvement of amblyopia after injury of the fellow eye

要約　背景：ヒトの視覚は生後3か月～8歳までの期間に感受性があり，発達するとされている。目的：右眼の弱視が左眼の外傷後に改善した症例の報告。症例：11歳男児の左眼に釣り針が刺さり，眼球破裂で受診した。手術後の矯正視力は，右0.7，左0.4であった。20歳になり，左眼の外斜視と複視で再受診した。矯正視力は右0.8，左0.3で，35Δの外斜視があった。プリズムによる眼位矯正下で立体視はなかった。左眼の外直筋を後転し眼位はほぼ正位，矯正視力は右0.9，左0.4になった。弱い立体視があった。結論：視覚の感受性があるとされる時期を過ぎても弱視が改善した。斜視手術後の立体視は，外傷前からあったと推定された。

Abstract.　Background：It is assumed that visual function develops until the age of 8 years and that treatment for amblyopia ought to be started before this age. Purpose：To report a case in whom amblyopia in the right eye improved after injury to the left eye. Case：A 11-year-old boy presented with rupture of the left eye due to injury by a fishing hook. Corrected visual acuity was 0.7 right and 0.4 left after treatment. He was seen at the age of 20 years because of exotropia and diplopia. Corrected visual acuity was 0.8 right and 0.3 left. He had exotropia by 35Δ. Stereoscopy was absent after prismatic correction of eye position. Corrected visual acuity improved to 0.9 right and 0.4 left after recession of lateral rectus of the left eye. Stereoscopy was imperfectly present. Conclusion：Visual acuity in the amblyopic eye improved after 11 years of age. Stereoscopic perception after strabismus surgery may have been present before injury to the fellow eye.