瞳孔視野計の視標サイズ変更による早期緑内障性視野異常の検出力

Detection of early glaucoma by pupil perimetry by changing the target size

要約　目的：瞳孔視野計で小さな視標を使い，早期緑内障の視野異常を検出した結果の報告。対象と方法：早期の緑内障10例11眼を対象とした。男性7名7眼，女性3名4眼で，年齢は31～78歳（平均59歳）である。原発開放隅角緑内障が4眼，正常眼圧緑内障が7眼にあった。瞳孔視野計で中心30°，76点の視野を視標サイズ4mm²で測定し，自動視野計による結果と比較した。結果：瞳孔視野計での視野異常検出率は53.2±32.5％，自動視野計との一致率は19.9±11.3％であった。Mariotte盲点は11眼中5眼（46％）で検出できた。結論：瞳孔視野計の視標を従来の64mm²から4mm²にすることで，早期緑内障の視野異常検出率が向上し，盲点が半数の症例で検出できた。自動視野計との一致率は，周辺での縮瞳率減弱のため低下した。

Abstract.　Purpose：To report the result of detection of visual field defect in early-stage glaucoma using pupil perimetry with small target size. Cases and Method：The study was made on 11 eyes of 7 males and 3 females. The age ranged from 31 to 78 years,average 59 years. Primary open-angle glaucoma was present in 4 eyes and normal-tension glaucoma in 7 eyes. Visual field was tested on 76 points using infrared pupil perimeter with target size of 4 mm². The findings were compared with those by automated perimetry. Results：Visual field defect was detected at the rate of 53.2±32.5％ by pupil perimetry. Findings agreed with those by automated perimetry in 19.9±11.3％. Blind spot was detected in 5 out of 11 eyes（46％）. Conclusion：Visual field defect in early glaucoma was detected at a higher rate by pupil perimetry using a smaller target size. Detection of blind spot was also facilitated. Findings with automated perimetry decreased due to lesser pupil reaction in the periphery.