非接触式眼圧計とゴールドマン圧平式眼圧計の眼圧読み値の乖離に及ぼす角膜厚の影響

Implication of corneal thickness on different intraocular pressure readings between non-contact and applanation tonometer

（P−1-25）　緑内障または非緑内障の41例82眼について，中心角膜厚と眼圧を非接触式眼圧計（NCT），ゴールドマン圧平式眼圧計（GAT）を用いて測定した。NCTとGATの眼圧読み値の乖離と中心角膜厚は有意な相関を示し（単回帰分析：R＝0.694,p＜0.0001），回帰直線は，中心角膜厚（μm）＝9.045×（NCT-GAT）＋547.38であった。角膜が厚いほどNCTの眼圧読み値はGATに対して高値となり，薄いほど低値であった。中心角膜厚はNCTとGATの眼圧読み値の乖離の要因であると結論される。

We studied 82 eyes of 41 patients with or without glaucoma regarding the central corneal thickness and tonometric readings by non-contact tonometer (NCT) and Goldmann applanation tonometer (GAT) . The correlation coefficient between central corneal thickness and difference of IOP readings (NCT -GAT) was 0.694 (p ＜ 0.0001) . The regression line was central corneal thickness (um) = 9.045 × (NCT -GAT) + 547.38. NCT readings showed higher values than those by GAT in eyes with greater corneal thickness and vice versa. The findings show the corneal thickness to be a major factor for discrepancy between NCT and GAT readings.