Ragetti's wooden eye was not CGI'd
Mackenzie Crook plays Ragetti, who had wooden eyes, we assumed it was a special effect, but according to the actor, he was actually wearing a special contact lens the whole time. During an Interview, Mackenzie said he had to get used to not blinking his eyes because of the “huge contacts” he wore. The lens didn't have a hole in it, and he couldn't see through it. Mackenzie was blind in one eye, which meant he had no depth perception so, especially during the sword fighting scenes, it was difficult for him.