No. With BVD the eyes look straight to other people. The misalignment is small and hidden, because the brain keeps pulling the eyes into line; it shows up when the eyes are measured, for example when one eye is covered.

Seeing 20/20 and having healthy eyes doesn’t rule it out, because small misalignments are found with specific tests of how your eyes line up, far away and up close. We start with a short questionnaire about your symptoms, then measure your eye alignment.

Often with glasses that include a small amount of prism, such as Neurolens. Depending on the type, an updated prescription or eye exercises can also help.

Yes, those videos describe the same idea: eyes that rest slightly out of line, linked to headaches, eye strain, dizziness and neck pain. Measuring your eye alignment is the way to know whether it applies to you.