Given the task definition and input, reply with output. Given scene/plot descriptions from movies or TV shows, and given a specific question about the scene, summarize the question into a title

In Dracula (1992), in the scenes in the asylum where Renfield is being held, the guards can be seen wearing cages on their heads. Why? Was this a normal practice? I have heard of head cages for inmates but not guards. I'm not sure what the purpose would have been other than protection, but give the rest of their body is unprotected there has to be more to it. I've included the best image I could find. If I can get a better one I will update.
Why are the asylum guards wearing cages on their heads?