Holladay法を用いた白内障術後屈折の評価

Changes in refraction following cataract surgery evaluated by Holladay method

　Holladay法とJaffe法で白内障術後の角膜乱視を評価した。対象は90度中心強角膜6mm小切開48眼，135度中心小切開46眼である。術後惹起乱視は，全経過を通して135度中心切開が90度中心切開より小さく，Holladay法とJaffe法の結果は一致した。また，Holladay法で術後早期に90度中心切開の切開経線の平坦化と直交経線の急峻化があったが，135度中心切開では90度ならびに180度経線の変化は軽度であった。一方，135度中心切開の切開経線の変化は，90度中心切開時の切開経線の変化に比べ軽度であったが，直交経線の変化は90度中心切開の直交経線の変化と同様であった。Holladay法は任意の経線上で屈折の変化が算出でき有用である。

We evaluated the postoperative astigmatism following cataract surgery in 94 eyes by Halladay and Jaffe methods. A 90-degree incision was used in 48 eyes and a 135-degree incision was used in 46 eyes. The surgically induced astigmatism was greater in the former than the latter group by either method. Flattening in the vertical meridian and steeping in the horizontal meridian was greater and more frequent in the former than the latter group by Halladay method. Evaluation by Holladay method showed lesser changes in the incision meridian in the latter than in the former group. Both groups showed similar changes in refraction along the horizontal meridian. Halladay method proved to be useful in evaluating the change of refraction along any meridian.