Many binocular vision disorders cause patients so suffer from similar symptoms. First, keep in mind that signs and symptoms are abnormalities that can indicate a potential problem, so it's always a good idea to get an evaluation by a licensed medical professional (optometrist, ophthalmologist) if you experience any of these. Signs are objective - that means it can be seen, evaluated, or tested (for example a visible eye turn). Symptoms are subjective, meaning experienced or apparent only to the patient (for example eye pain, tired eyes, etc.).
The graphic below illustrates some common binocular vision disorders encountered in an eye clinic (this is by no means an exhaustive list).
Esotropia - (eye turns in) or a constant outward deviation of the eye. Esotropia is where one eye looks directly at the object being viewed and the other is misaligned inward toward the nose. This is commonly referred to as crossed eyes or cross-eyed.
Exotropia - (eye turns out) or a constant inward deviation of the eye. Exotropia is where one eye looks directly at the object being viewed and the other is misaligned outward away from the nose. This is also called wall-eyed.
Convergence Insufficiency - The eyes are unable to maintain convergence at near for an extended period of time (reading a book for example). These patients may intermittently lose fusion which causes double vision and other symptoms mentioned here.
Divergence Excess - is an over-divergence when attempting to look at distant objects.
Refractive - also known as anisometropic amblyopia. This occurs when there is a high degree of nearsightedness or farsightedness in one or both eyes
When the two eyes do not function together appropriately, a patient can present with eye issues through a variety of symptoms and signs. Symptoms of a Binocular vision dysfunction may include (but is not limited to):
Signs of a binocular vision disorder are more obvious (and maybe concerning if they are brand new!)
As you can see, the list of SIGNS easily observed that suggests a disorder of binocular vision is far less than SYMPTOMS. To further complicate the symptom/sign discussion, conditions like a history of a head or traumatic brain injury may exacerbate these symptoms.