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Hi, this is Dr Ansari, welcome to JA.
This is a double vision called Diplopia. Diplopia is the simultaneous perception of two images of a single object that may be displaced horizontally, vertically, diagonally, or rotationally in relation to each other. There are several causes in your case it is obvious brain damage( Accident). You need to visit a neurologist and after examination, you will be advised to do an MRI brain with contrast. This will clarify your situation and management.