I put my babies outside at about 6 weeks and worried about them all night but they were fine so now they are outside!!!
they like to huddle together when they are sleeping!

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Three questions
1. Is 54 degrees too cold at night at 5 wks old?
i think that would depend on what/ where they are, if they are in corner with no wind or draft, and they have a place to huddle together and keep warm, like a small nest box, or something, they will prob just pile on top of each other and fluff out their feathers a bit, and keep themselves warm. Least that is what mine do, they'll just all three huddle in one of the nest boxes, and stay warm in there, ( i know it gets warm in there cuz i peeked in on them one of the first nights i left them outside, just to make sure they were ok.
2. Will they fly away over a 6' fence? from what i've read that depends on the bird, some birds fly some dont, but just some advice, I wouldn't leave them out roaming around unless you are outside with them, just to make sure they don't eat something or get stuck somewhere, or get carried away by a bigger bird
3. Can they see in the pitch black of night like some other animals can?
i have no idea!
I'm new to this but, my husband bought some baby chicks, turkeys and two ducklings. The are getting big pretty quick and are currently in a cage my husband built for them. We are not sure how old they are, however, we are needing to know if they ate old enough to stay outside in the chicken coop. We live in North Central Florida and it has been in the 80's here and the nights have been in the upper 50's lately. Would they be ok to stay outside 24/7?
Lol, I agree with not giving them credit for night visionMy store-bought chicks are 10 days old now, but I put them with a hen that had gone broody, so she's taking full care of them. They've been out in the coop since day one, but with a 'mum' (albeit a surrogate one) to keep them warm at night, so even though it got down to 1°c last night (about 30°f), they were fine this morning. As long as they are fully feathered, I wouldn't have thought that 54°f was too cold for them, especially if they are in a coop where they can huddle together.
With regard to the fence, my experience is that an 18-inch high fence wil stop a grazing chicken from straying on to next-door's land, but even 6' fence won't necessarily stop a determined (or extremely panicked) chicken from getting where it wants to be. As long as your chickens are happy where they are, with plenty to keep them occupied, they're not likely to put a lot of effort into flying over a fence. Mine don't even attempt to get over the 18" high net that separates my back garden from the field next door. However, when Cinders (a large Marans hybrid, who is usually too ungainly to even get off the ground) got separated from the others behind a 4' high fence, she got so panicked and desperate that she managed to fly over it without even a running start! Personally, unless you are having a problem with them getting out of where they should be, I would never clip their wings - all that does is prevent them getting away from a predator, should one ever get into your yard.
As far as night vision goes, there is something about the dark that makes chickens completely docile. Mine free range all day, and I can't get near them to pick them up. Night time in the coop is completely different - the only time I can pick them up and check them over, as they are completely dopey. I wouldn't give them credit for any night vision at all!!!