I am dealing with wearing crap bifocals and I am now more than usually daunted by big looming things, especially in the dark and especially in woods. And as I age I see worse in the dark of winter. Just makes me wonder if a lot of ghosts/creepy sightings were reported by people with vision problems. And just think, before there were corrective lenses; a wise old person would see poorly and would see things in their village somewhat weirdly, and if they were a bit imaginative they could start and pass on tales. Not an explanation for everything, but an explanation for some legends.