Contrary to what you see in the movies and on TV, you should not see two overlapping circles when looking through binoculars. The distance between the lenses should be adjusted such that you see a single circle when looking through the binoculars.
Any pair of binoculars you consider should have adjustments to compensate for differences between the left and right eye (and the binocular optics). To adjust the binoculars, look through the left eye only and, using the center- focus mechanism, carefully focus the binoculars on an object which has some fine detail on it. Now, without moving the center focus mechanism, and using the right eye only, adjust the right eyepiece for sharpest focus on the same object. Repeat the process a time or two to ensure best adjustment. Now, both eyes will be in focus when the center focus wheel is moved. Remember to check the right-eye setting from time to time. It's easy for it to get out of adjustment.
Repair : Learn how to repair binoculars.