視神経炎の回復期中心視野における測定範囲による感度変化

Sensitivity variation in the central visual field during recovery from optic neuritis

　正常者，視神経炎において中心視野の測定範囲限定による効果を検討した。対象は正常者と視力0.8以上の視神経炎患者で，第1群は正常者10例10眼，視神経炎12例12眼，第2群は正常者10例10眼，視神経炎17例18眼であった。方法は自動視野計オクトパスによって視野測定し，第1群は中心30°と中心10°を測定する2つのプログラムを，第2群は中心10°と中心5°を測定する2つのプログラムを施行し，共通測定点の平均感度について2つのプログラム間で比較検討した。正常者，視神経炎患者において1,2群とも測定範囲を狭くしていくと，平均感度が上昇することがわかった。

We studied the sensitivity change with a de-creased visual field size in normal subjects andpatients with optic neuritis. The patients had avisual acuity of 0.8 or better. The subjects weredivided into two groups. The first group included 10eyes of 10 normal subjects and 12 eyes of 12 patientswith optic neuritis. The second group subjects were10 eyes of 10 normal subjects and 18 eyes of 17patients. The subjects of the first group weremeasured with an automated perimeter Octopus bythe two programs, the one has test points arrangedto a central 30° visual field and another, to central10°. The second group subjects were examined bythe two programs, the one has test points arrangedto a central 10° visual field and another, to central 5°. The mean sensitivity of the same points wascompared between the two programs. In normalsubjects of the two groups, the mean sensitivitysignificantly increased with a decreased visual fieldsize. In the first group patients with optic neuritisthe mean sensitivity significantly increased with adecreased field together with the increased sensitiv-ity in the abnormal points. In the second patientsgroup the mean sensitivity unchanged despite thechange of visual field size. The reason for un-changed sensitivity was considered to be largervariation in sensitivity during the course of opticneuritis. The effect of testing field size on sensitiv-ity was operative in both normal subjects andpatients with optic neuritis.