[Retracted] Modified Trabeculectomy versus Glaucoma Drainage Implant Surgery: A Retrospective Comparative Study for Refractory Glaucoma Treatment

Figure 7

The different types of filtration bubbles after operation. The Kronfeld scale was used to evaluate the follicular function—I: microcystic type; II: diffuse flat type; III: scar type; IV: package type. I and II types were considered as functional follicles; III and IV types were defined as nonfunctional follicles.