Double Vision: Causes and Solutions

Understanding Double Vision

Double vision—or diplopia—means seeing two images where there should be one. These images can sit side by side, one above the other, or both. It's more than a visual nuisance: it affects balance, movement, and your ability to read or work. The good news? It's treatable. The first step is understanding what's causing it.

Double vision comes in two types. Monocular double vision affects only one eye. Binocular double vision affects both. You can test this yourself: if you cover one eye and the doubling disappears, it's binocular. If the affected eye still sees double or blurred, even when the other is covered, it's monocular.

What Causes Double Vision?

Double vision happens when your eyes don't work together properly. Each eye creates a separate image. Your brain normally fuses them into one clear picture. When the muscles that move your eyes, the nerves controlling them, or the brain centres that coordinate them are damaged, you see two images instead of one.

The cause varies. Sometimes it's something simple. Sometimes it signals a deeper health issue.

Binocular Double Vision

Binocular double vision often stems from strabismus (crossed or misaligned eyes). In childhood, misalignment is fairly common. If left untreated, it can persist into adulthood and trigger double vision. Muscle weakness—from thyroid disease, myasthenia gravis, or nerve damage—also causes binocular diplopia.

Often, binocular double vision points to systemic problems:

• Blood vessel or circulation disorders in the brain
• Infections
• Side effects from medications
• Temporary or permanent brain injury
• Nerve or muscle disorders

Monocular Double Vision

Monocular double vision is usually a sign that one eye itself has a problem—not a coordination issue. Common causes include:

• Corneal scarring or irregularity
• Cataracts
• Refractive errors (uncorrected myopia, hyperopia, or astigmatism)
• Dry eye syndrome
• Retinal problems

Monocular diplopia often improves with glasses, contact lenses, or eye drops—depending on the underlying cause.

When Double Vision Is Temporary

Sometimes double vision passes quickly. Alcohol or drug use, extreme fatigue, or temporary muscle strain can cause it. However, even temporary double vision warrants a doctor's visit. What seems fleeting might signal something serious.

Treatment Options

Treatment depends entirely on the cause and severity. Your eye doctor will first diagnose the root problem. Options include:

• Eye exercises to strengthen coordination
• Specialised glasses or prisms to align images
• Surgery to correct muscle imbalance
• Treating underlying health conditions (managing diabetes, thyroid disease, etc.)
• Medication changes if drugs are responsible

For refractive causes—where the eye's shape or lens causes doubling—laser eye surgery like Flow3 or ICB lens replacement can restore sharp, single vision. If you're not suitable for laser treatment, ICB lens replacement is an excellent alternative.

Key Facts About Double Vision

• Double vision has many different causes
• It can affect one eye or both
• Childhood eye misalignment sometimes leads to adult double vision
• Temporary double vision may result from alcohol or drug use
• Treatment ranges from exercises and glasses to surgery and systemic health improvement
• Always see an eye doctor promptly—some causes are urgent

Why See a Specialist?

Double vision isn't something to ignore or self-diagnose. It can affect safety—driving, climbing, or simple balance—and it often reflects treatable conditions. At KSA Silmakeskus in Tallinn, we've performed over 55,000 procedures and specialise in both laser eye surgery and lens replacement. Our entire clinical team chose Flow3 for their own vision—that's the trust we live by.

If you're experiencing double vision, book a consultation. A precise diagnosis is the first step to clear vision again.