Before Locke and Key was a Netflix series, Mark played Rendell Locke in the TV pilot.
Mark said on Twitter that he was completely blind in the scene where he visits his son:
I have a green screen covering one eye and a scleral contact lens completely covering the other. I had to walk that distance and lean precisely into the camera without being able to see a thing.@MarkRPellegrino
Sounds tricky, but it’s an interesting effect!