オクトパス視野計におけるtendency oriented perimetryの再現性

Reproducibility of tendency oriented perimetry using Octopus perimeter

　Tendency oriented perimetry （TOP）では各測定点の計測が1回しか行われないため，短期変動（SF）の計測ができない。今回筆者らはTOPの再現性について検討した。対象は正常者38例38眼，高眼圧症9例9眼，緑内障39例39眼で，全症例に対してOCTOPUS1-2−3視野計のG1Xプログラムを用いて2回連続でTOPによる計測を行い，normal strategy （NS）との比較も行った。TOPによる初回と2回目のmean defect （MD），loss variance （LV）の平均には差がなく，初回と2回目の相関関係では強い正の相関性をみた。MDとSFの相関関係はTOPでy＝0.18x＋1.45（r＝0.81），NSでy＝0.08x＋1.6（r＝0.51）となり，緑内障におけるTOPのSF （3.0±0.9dB）はNSのSF （2.3±0.6dB）より有意に大きくなった（p＜0.0001）。視野の沈下部位で閾値の変動が大きくなるためTOPではSFが大きくなると思われた。

Short-term fluctuation (SF) cannot be evaluated in tendency oriented perimetry (TOP) , because each test point is examined only once. We evaluated the reproducibility of TOP in 86 eyes of 86 persons. They comprised 38 normal eyes, 9 eyes with ocular hypertension, and 39 eyes with glaucoma. Each eye was tested twice consecutively for TOP using program G1X of Octopus 1-2-3. There was no difference between the two tests regarding the mean of mean defect (MD) or loss variance (LV) . A significant positive correlation was present between the first and second test in MD and LV. The regression line between MD and SF was y=0.18x +1.45 (r=0.81) for TOP and y=0.08x+1.6 (r=0.51) for normal strategy. In glaucoma eyes with visual field defect, the short-term fluctuation for TOP was 3.0 ± 0.9 dB and that for normal strategy was 2.3 ± 0.6 dB. The difference was significant (p ＜0.0001) . The increased value in short-term fluctuation appeared to be due to larger fluctuations of threshold in depressed areas in the visual field.