Monocular double vision, or double vision in one eye, is less common than binocular double vision. Both conditions are distressing and serious, requiring urgent attention from a medical professional if they continue for any length of time.

Also called Diplopia, this condition can have many causes. It happens when the eyes, rather than co-ordinating, fail to produce a single image on which to focus. A ‘ghost’ image can be seen, or just a general blurring of the vision.

Temporary double vision in both eyes can be brought about by fatigue or drinking too much alcohol. Astigmatism is another cause, when the cornea has become irregularly shaped. This can occur in one or both eyes and is rectified by glasses, contact lenses or corrective surgery.

Similarly corneal disease, damage or deterioration, for example due to keratoconus corneal dystrophies, can bring about a similar vision disturbance. The range of treatments for these conditions includes special contact lenses, implants or even a corneal transplant.

Sudden, persistent double vision may have a more serious cause, including a head injury, stroke or problem with the cranial nerve. Other brain problems, such as an aneurysm, swelling or tumour, can also cause diplopia. In all of these cases, a neurologist or neurosurgeon may need to investigate the condition further.

If you are experiencing double vision please make an appointment today with a medical professional.


  1. Article on Double Vision Reviewed by Ann Marie Griff, OD.