Advanced Binocular Vision (ABV) Exam 2 Practice

A septum in binocular testing is used to dissociate the eyes by blocking the other eye’s view, so each eye sees a different image. This is helpful when there’s nothing to fuse because it prevents accidental fusion and lets you assess each eye’s input separately. By isolating the eyes, you can reveal suppression, misalignment, or monocular function that might be hidden when the eyes are allowed to fuse. The other options don’t fit because a septum doesn’t measure color vision, it doesn’t directly change convergence, and it isn’t a tool for testing depth perception.