Frequency doubling perimetryによる視交叉圧迫性病変の検出

Frequency doubling perimetry in the detection of compressive lesion in the chiasmal area

　目的：視交叉近傍の圧迫性病変による半盲の検出でのfrequency doubling perimetry （FDP）とハンフリー視野解析装置（HFA）の比較。

　対象と方法：視交叉近傍の圧迫性病変のある14例28眼と正常省20例を対象とした。ハンフリー閾値テストでの中心30-2とFDP threshold c−20で測定し，測定時間，MD, PSD，および独自に定めた半盲比（耳側視野の平均感度／鼻側視野の平均感度）を検索した。

　結果：平均測定時間は，HFA 14.4分，FDP 4.6分であった。MD, PSD，半盲比には，HFAとFDP間に有意の相関があった。これらは腫瘍病変手術後に有意に改善し，半盲比の手術前後の変化は80％で，HFAとFDP間で一致した。

　結論：FDPは視交叉圧迫性病変による半盲の検出に有用である。

Purpose: To compare findings by frequency doubling perimetry (FDP) and by Humphrey visual field analyzer (HFA) in patients with compressive lesions in the chiasmal area. FDP findings are supposed to reflect the magnocellular projection in the retinal ganglion cells.

Cases and Methods: We evaluated 14 patients with hemianopia secondary to compressive chiasmal lesions and 20 normal persons. All the cases were examined by HFA central 30-2 and by FDP c-20 threshold tests. We compared the measuring time, MD, PSD, and hemianopic ratio between the two methods.

Results: The measuring time averaged 4.6 min for FDP and 14.4 min for HFA. There were significant correlations between the two methods regarding MD, PSD, and hemianopic ratio. Changes in hemianopic ratio before and after surgery were the same in 16 patients (80%) by FHA and FDP.

Conclusion: FDP was useful in detecting chiasmal compressive lesion with hemianopia.