（18）後水晶体線維増殖症症とその成因に対する考察

Cases of retrolental fibroplasia and causes of their occurrence

　逐年増加の傾向のある早産児失明の原因として重要なる問題をなげかけている後水晶体線維増殖症に関する研究は，欧米に於ては多数の業績があり，わが国に於ても，三井^1），奥田^2），赤木^3），吉岡^4）氏等により研究が行われつつある。吾々も，既に興味ある症例を報告し，その本態に関しても実驗的研究を進めて来た。今回は症例を迫加し，同時に，之の成因に関して推察を加えてみたいと思う。

As a continuation of the previous paper, authors aditionally reported four cases of retro-lental fibroplasia in this paper and described the following conclusion.

1. It is pointed out again that this disease has been diagnosed erroneously to be the opthalmia metastatica in Japan.

2. The cause of this disease may be considered dualism. Namely, the young or stunted state of tissues can be given as a predisposition to the disease, while not only anoxia oryephroxia but also various other factors can be thought as a direct stressor. 3. The consideration above mentioned can be supported by the animal experiment, in which authors observed the productive changes on some retinas of such animals as young rats exposed under the low oxygen tension, bufo vulgaris japonicus exposed to the supersonic waves and some tadpoles of bufo vulgaris japonicus collected in Tokushima Prefecture.