回転式Scheimpflugカメラによる挿入眼内レンズ表面散乱のデンシトメトリ解析

Densitometry analysis of surface scatterings of implanted intraocular lens using rotating Scheimpflug photography

要約　目的：挿入眼内レンズ（IOL）の表面散乱のデンシトメトリ解析において，回転式Scheimpflugカメラと固定式Scheimpflugカメラの互換性を検討した。方法：軟性アクリル製IOL挿入後6か月以上経過した84例132眼に対して，回転式のPentacam^®と固定式のEAS1000の両方法でScheimpflug像を同一日に撮像した。IOL前後面において同一サイズのエリアで，デンシトメトリ解析を行い，両方法の相関関係を調べた。結果：固定式Scheimpflugカメラでの測定値が170 computer-compatible tapes以下では，IOL前後面において有意な線形回帰が得られ（p＜0.0001），決定係数0.96，0.78と強い相関であった。結語：回転式ScheimpflugカメラによるIOL表面散乱のデンシトメトリ解析は，従来の固定式と互換可能で，後発白内障や表面光散乱の評価に有効であると考えられた。

Abstract.　Purpose：To examine compatibility of densitometry analysis of surface scatterings of implanted intraocular lens（IOL）between rotating and fixed Scheimpflug photographies. Method：For 132 eyes of 84 patients who implanted foldable acrylic IOL more than 6 months after surgery, Scheimpflug images were acquired using a rotating photography（Pentacam^®, OCULUS）and angle-fixed camera（EAS1000, Nidek）on the same day. Densitometries on the IOL anterior and posterior surfaces were analyzed in the same area size for the both Scheimpflug images, and the correlation between the two measurements was evaluated. Results：There was significant linear regression between the two measurements on the anterior and posterior IOL surfaces（p＜0.0001, r²＝0.96 and 0.78, respectively）, when the scattering intensity was less than 170 computer-compatible tapes in the angle-fixed camera. Conclusion：Densitometry analysis with rotating Scheimpflug photography was compatible with the conventional analysis with the angle-fixed, and was effective in assessing posterior capsular opacity and surface light scattering.