Takesue Atsuhide, Nakao Shintaro
Department of Ophthalmology, Juntendo Nerima Hospital, 3-1-10 Takanodai, Nerima-ku, Tokyo, 177-8521, Japan.
Department of Ophthalmology, Juntendo University Graduate School of Medicine, Tokyo, Japan.
BMC Ophthalmol. 2025 Jul 28;25(1):430. doi: 10.1186/s12886-025-04280-9.
Traumatic aniridia mainly occurs following blunt trauma to the eyeball. Navon hypothesized that ‘‘sudden block by the iris’’ was a necessary step in the development of traumatic aniridia, but this has not been confirmed.
The patient was a man in his 70s who sustained a right eye injury in a fall onto an umbrella stand. Slit lamp examination of the right eye revealed brownish spherical tissue in the anterior chamber, which was one-third filled with hyphema, and brownish pigmentation was observed beneath the conjunctiva. The next morning, following a dramatic decrease in the hyphema, it was surprising to find that none of the previously observed spherical tissue was present and the iris was absent around the whole circumference. The entire iris had seemingly been expulsed under the conjunctiva via an old surgical wound.
The photograph in this case might show the ‘‘sudden block by the iris’’ hypothesized by Navon almost 30 years ago. The photograph may be one piece of indirect and partial evidence that supports ‘‘sudden block by the iris occurs as a precursor to traumatic aniridia’’.
外伤性无虹膜主要发生于眼球钝挫伤后。纳冯曾推测“虹膜突然受阻”是外伤性无虹膜发生过程中的一个必要步骤，但这一点尚未得到证实。
患者为一名70多岁男性，因摔倒在伞架上导致右眼受伤。右眼裂隙灯检查发现前房内有褐色球形组织，前房积血占三分之一，结膜下可见褐色色素沉着。次日清晨，前房积血显著减少，令人惊讶的是，先前观察到的球形组织均已不见，整个圆周周围均无虹膜。整个虹膜似乎已通过一个陈旧的手术伤口被挤出至结膜下。
该病例的照片可能显示了纳冯近30年前所推测的“虹膜突然受阻”情况。这张照片可能是支持“虹膜突然受阻是外伤性无虹膜先兆”的一条间接且部分的证据。
