Wander Darkly Puns

My dad has been telling this goddamn joke for as long as I can remember -

It's night and completely dark, the only light that shines on the deserted street comes from a lightpost which stands over the sidewalk. A little mouse is frantically wandering around near the lightpost when he gets interrupted by a bear. The bear is curious and asks the mouse what he is doing. The mouse responds: I'm looking for my lense, it fell out and I can't find it. The bear asks if the mouse needs help and the mouse gladly accepts the offer. "Do you know where you were standing when you lost your lense?" asks the bear. The mouse casually points across the street into the black abyss and says "about there, I guess". The bear is surprised by this answer and asks why the mouse isn't looking over there. With a dumbfound look on his face the mouse looks at the bear and says: "Well yeah, but at least I have some light here."