Mesure de la résistance à l'écoulement de l'humeur aqueuse au moyen du tonomètre électronique. 1 : Résultats chez le sujet normal

1. The authors use an “electronic tonometer”, which consists of a combination of Schiøtz’s apparatus with an electric installation. In use, the tonometer shows continuously and graphically the differences in tension, similarly to the electro-cardiogram. During 5 min. in which the tonometer was placed on the cornea, they measured the slackening of tension. By bringing in Friedenwald’s tonometer charts it is possible to find the resistance present in normal eyes during the draining off of aqueous humour. 2. This resistance varied in 46 cases between 2.9 and 7.3, the mean being 4.5. 3. The authors discuss the relative importance of the trabeculum, the Schlemm’s canal, the acqueous veins, the intra-scleral blood vessels and the laminary veins in the resistance of the flow of the aqueous humour by the way of the emissaries of the anterior segment of the eyeball. 4. It appears that it is possible to use the calculation of resistance as a standard for the quantity of aqueous humour flow. The mean in 46 normal individuals is 1.63 c.mm. a minute. © 1952 S. Karger AG, Basel.