we can get in the technicality of what is or is not a good earplug set or eyemask, but the point here is to look at the main action of introducing, by the action of one person, light or noise in a cabin otherwise dark and quiet. This action of a single person would require all or most other people to use a tool to avoid the pollution introduced. That does not seem fair to me, regardless of quality of tools provided by BA to remove such pollution.