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Spyglass: Objects viewed through a spyglass are magnified to twice their size. Characters using a spyglass take a –1 penalty on Perception skill checks per 20 feet of distance to the target, if the target is visible.
It should be important to note that using a spyglass assumes you are using light-based vision, but since it doesn't call it out...
A PC with 60' darkvision trying to see something 60 feet away using a spyglass would have a -3 to the Perception check, instead of -6.
There's nothing RAW to extend the actual range of a character's darkvision using mundane items (unless it's an alchemical item or goggles in a splatbook I don't have; a few other board members are very good at researching that kind of thing).

Scaevola77 |

It is important to note that darkvision is magical, not natural. So no, spy glass would not work for darkvision but should for low light (assuming the target of the spyglass is in such conditions.
Of course, this is my interpretation. I don't believe such a thing has a particular ruling.
Depending on interpretation, not all darkvision is magical. One can argue that dwarves, orcs, and other subterranean races have natural, not magical, darkvision as they are born with it.
I always envisioned darkvision as behaving more like infrared vision (or another non-visible light spectrum based vision), in which case the spyglass would work as normal for them. I think that particular definition is a holdover from Forgotten Realms though. The Pathfinder rules state it is the ability to see without light, so it is a judgement call for whether it means without visible light, or any light at all. It really comes down to personal interpretation.