超音波生体顕微鏡を使用したヒト水晶体，チン小帯，毛様体皺襞部の観察

Observation of the human crystalline lens, zonule of Zinn and pars plicata using ultrasound biomicroscope

要約　目的：超音波生体顕微鏡を使用し水晶体，チン小帯，毛様体皺襞部を観察した後，散瞳による変化を調査した。

対象と方法：対象は正常例5眼と白内障例3眼。画像処理で各組織の輪郭を明瞭にし，水晶体前後径，赤道径そして最下に位置するチン小帯の水晶体付着部と毛様体皺襞部の付着部とを結ぶ直線と前者から毛様体扁平部に至る水平軸との角度を計測した。

結果：正常例は散瞳後に全例の赤道径が長くなり角度も大きくなった。白内障例でこうした所見はなかった。

結論：正常例と白内障例の水晶体重量の差が，所見の違いに関係するのではないかと考えた。

Abstract　Objective：After using ultrasound biomicroscopy to monitor the crystalline lens, zonule of Zinn, and pars plicata ciliaris, we examined changes due to mydriasis.

Subjects and Methods：Five individuals with normal eyes and three patients with cataracts. We clarified the contours of each tissue following image processing. We measured the anteroposterior and equatorial diameters of the crystalline lens, the straight line connecting the attachment site of the zonule of Zinn to the inferior edge of the crystalline lens and the attachment site of the pars plicata ciliaris and the angle formed by this line, and the horizontal axis leading to the ciliary ring.

Results：In all the healthy individuals, the equatorial diameter and angle both increased after mydriasis. There were no such findings in patients with cataract.

Conclusion：The results suggest that the difference in mass between crystalline lenses that are healthy and those affected by cataracts may be related to the difference found in this study.