[Differential diagnosis of amaurosis fugax by tonography]

In unilateral stenosis of the internal carotid artery tonography shows the differences in amplitudes in a comparison of the two sides; in bilateral stenosis it shows markedly reduced amplitudes with an intermittent absence of the pulse amplitudes. When extrasystoles occur there are characteristic reductions in the amplitudes. As a result, this method of examination can be very important in the differential diagnosis of amaurosis fugax. Thanks to its simplicity and the fact that an ECG can be made simultaneously the method has a wide range of clinical applications.