Figure 3: Gonioscopical photographs after two iStents’ implantation in the present study. (a) The upper stent (GTS100R) in the left eye was implanted upwardly using clockwise rotation, that is, against gravity. No malposition was observed. The lower photograph of the same eye shows the lower stent (GTS100L) implanted downwardly using counterclockwise rotation. (b) Obstruction due to the iris was only observed in one of the two stents. The upper stent (GTS100L) in the right eye is obstructed, while the inlet of the lower stent (GTS100R) is open. (c) Blood reflux from the upper stent (GTS100R) was observed in the same eye as (a) immediately after the placement of the gonioscopy. The upper and lower photographs show the time course.