自動非接触型眼圧計CT−50の臨床評価

Clinical evaluation of an automated noncontact tonometer CT-50

　人間ドック929眼の眼圧を自動非接触型眼圧計CT−50（トプコン社）により連続3回測定し，ゴールドマン圧平眼圧計（GAT）の計測値と比較，検討した。GAT平均値14.7±3.4mmHgに対して，CT−50の平均値は15.2±4.0mmHgであった（p＜0.01）。CT−50による3回計測値の91％は眼圧変動幅3mmHg以内にあった。GAT値との相関回帰式はCT−50＝0.870×GAT＋2.40で，相関係数は最高で0.736（平均値）となり，既報の手動非接触型眼圧計との相関係数より低かった。

We measured the intraocular pressure in 929 apparently healthy eyes enrolled in a health-check program. Tonometry with Goldmann applanation tonometer averaged 14.7±3.4 mmHg (x). Tonometery with a new automated noncontact tonometer CT-50 (Topcon, Tokyo) averaged 15.2±4.0mmHg (y). Both methods gave similar readings (p＜0.001). In 91% of the eyes, the readings of consecutive three measure-ments by CT-50 in each eye were within±3mmHg. The regression equation was y=0.870x+2.40. The best correlation coefficient between both methods was 0.736. This value was lower than reported values by manually operated noncontact tonometers.