Double vision is assessed and managed through a step by step clinical pathway designed to work out where the visual disruption is coming from, whether that’s the eyes not aligning properly, a weakness in the eye muscles or an issue with the nerves that control how both eyes work together. Roughly 1 in 50 people will experience some form of diplopia during their lifetime, even if only briefly.
What is usually checked first?
The process normally begins with a straightforward but detailed discussion about what the person is experiencing. This includes when the double vision started, whether it affects one eye or both and whether the images appear side by side or on top of each other.
It also helps to know if the problem is constant or comes and goes, and whether it changes with tiredness or certain directions of gaze. A simple vision check follows, along with a cover test, which helps to establish whether the eyes are properly aligned or working independently.
How is the problem explored further?
From there, orthoptists assess how the eyes move together in different directions and whether there is any imbalance in muscle control. They may also test focusing ability and check how the eyes respond when following moving objects.
These observations help to build a clear picture of whether the issue is mechanical, muscular or neurological in nature. If something more complex is suspected, patients may be referred for scans or blood tests through hospital pathways to rule out underlying medical conditions.
Around 60% of cases involving binocular double vision are linked to problems with eye coordination or nerve signalling rather than damage to the eye itself.
What conditions are often linked with double vision?
Several underlying conditions can contribute to diplopia, including thyroid eye disease, diabetes-related nerve changes, cataracts and neurological disorders affecting the brain or cranial nerves. The way symptoms behave is often an important clue, especially if double vision fluctuates during the day or only appears in specific directions of gaze.
Around 30% of cases seen in orthoptic clinics are ultimately linked to broader systemic health issues rather than isolated eye problems.
What treatments are available?
Treatment depends entirely on the cause. Some people are helped with prism lenses that adjust how images are seen so they align more comfortably.
Others may be given tailored eye exercises to improve coordination over time. If an underlying health condition is found, that is treated alongside the visual symptoms. In longer term cases where alignment does not improve, eye muscle surgery may be considered to correct positioning.
When is double vision urgent?
If double vision appears suddenly, it is treated as urgent because it can sometimes be linked to serious neurological conditions such as stroke or cranial nerve palsy. In these situations, rapid assessment is arranged to rule out anything immediately serious and ensure appropriate treatment is started quickly.
Around 15% of urgent eye-related assessments for double vision are associated with conditions requiring immediate neurological investigation.
