Did you evar look through your binocular head and see twice as much of the same thing. You have double image..
One possible solution for double image or double vision is to remove each eyepiece and shake them gently. If you here the lenses moving inside- tighten up the lens retainers for the eyepieces (make sure the lenses are not slanted inside - they will crack)- reshake the eyepieces and check the image for singularity while looking at a specimen with the 10x objective. The lenses on slant might be causing double image.
Some binoculars have tubes that screw on to the prism box of the binocular head. One might be loose - on a slight tilt - causing the bouble image. Hand tighten the tube to the binocular and recheck the image for singularity while looking at a specimen with the 10x objective..
The prism or mirror in each side of the binocular head might be loose or slightly out of adjustment. The way to check for the problem in a Sidentopf head ( binocular with a center post ) is to move each side of the binocular while looking through it at a specimen on 10x. The image should rotate cocentrically. If one side or the other rotates eccentrically it needs to be repaired.
Lens order in the the eyepieces - if incorrect- will cause some double image. The most common eyepiece is a 10x widefield. Lens order is usually withe greatest covexity of each lens towards each other. Otherwise send them in for repair.
The last cause of double image might be a bent casing or the center prism in a conventional binocular is out of adjustment.