From personal experience, it's easier to hunt spiders in the dark partly because they are nocturnal and partly because their eyes reflect light. Shine a flashlight at night into a patch in your garden or inside an old shed. All those little pin-points of light? Spiders.
Comedy.
Tragedy.
There's something rather disturbing about crab spider eyes, like some amorphous monstrosity staring up from the ocean floor.
Of course, if looking at all these beady, little eyes bothers you, you can always go with these eyeless mygalomorphs from the Dominican Republic. They spend their entire lives in pitch black caves and so don't need eyes. Oh, yeah, that's far less creepy.
Some beady little eyes are on the spider's abdomen. Apparently, these marking resemble a face just enough that potential predators decide to look elsewhere.
Okay, that's just plain weird.
Some spiders mimic insect compound eyes (in this case, a moth's) to fool potential moth mates to approach and make an overture. It will be their last.
While most people in developed nations exhibit some spider fear, about 3.5 to 6.1% suffer from extreme fear or arachnophobia. Some celebrities who admit to having it include Justin Timberlake and Christopher Lee. Others include every single female on planet earth. The reason for spider fear is not conclusive.
Now before we get all creeped-out, remember that spiders enable us to live. They are THE primary insectivore. On average, a single spider devours 2000 insects a year. Without them, we would literally drown in an ocean of insects within a few weeks time. Your house SHOULD have spiders in it and a few centipedes as well. They prevent roach and termite infestations which will destroy your property.