非接触型光学式眼軸長測定器によるシリコーンオイル注入眼に対する測定精度

Accuracy of axial length measured by noncontact optical instrument in eyes filled with silicone oil

要約　目的：シリコーンオイル注入眼での非接触型光学式眼軸長測定器による精度の報告。対象と方法：硝子体手術でシリコーンオイルを注入し，その後これを抜去した26眼で眼軸長を測定した。測定にはIOL Master^TMを用いた。うち13眼ではシリコーンオイル抜去後に眼内レンズを挿入し，その前後で眼軸長を測定した。結果：眼軸長の平均は，シリコーンオイル抜去前24.28±3.03mm，抜去後24.26±2.87mmで，両群間に有意差はなかった。シリコーンオイル注入眼での眼軸長は，超音波による測定値と同じであった。結論：IOL Master^TMで測定したシリコーンオイル注入眼の眼軸長は，抜去と同時に挿入する眼内レンズの屈折力の決定に使うことができる。

Abstract.　Purpose：To report the accuracy of axial length measured with a noncontact optical instrument in eyes filled with silicone oil. Cases and Method：This study was made on 26 eyes that received vitreous surgery with the vitreous replaced by silicone oil. Measurement was made before and after removal of silicone oil. An IOL Master^TM was used for measurement. Thirteen eyes received implantation of intraocular lens（IOL）after removal. Results：The axial length averaged 24.28±3.03 mm before and 24.26±2.87 mm after removal of silicone oil. There was no significant difference between the two values. Refraction after IOL implantation based on the present method was essentially the same as that by conventional ultrasound measurement. Conclusion：There is no difference in axial length in eyes filled with or without silicone oil when measured by IOL Master^TM. IOL implantation can be made immediately after removal of silicone oil based on the measured axial length.