What is convergence insufficiency?

When Your Eyes Don't Work Together

Convergence insufficiency is a common condition where the eyes have difficulty working together when looking at near objects, such as books, tablets or computers. Instead of turning inwards comfortably, one eye may drift slightly outward, making close work more difficult and tiring.

Children and adults with convergence insufficiency often have perfectly normal distance vision, which is why the condition can easily go unnoticed during a routine eye test.

What Is Convergence?

Whenever you read, write or use a digital device, your eyes must work as a team by turning inwards to focus on the same object. This movement is called convergence.

In people with convergence insufficiency, the eye muscles struggle to maintain this inward position for prolonged periods. As a result, the eyes become tired and symptoms develop during near work.

Common Symptoms

You may experience:

• Eyestrain when reading

• Headaches after close work

• Blurred vision at near

• Double vision while reading

• Difficulty concentrating

• Losing your place while reading

• Words appearing to move on the page

• Closing one eye while reading

• Frequent rubbing of the eyes

• Fatigue after school or computer work

• Reduced reading endurance

Children may avoid reading altogether because it becomes uncomfortable rather than because they dislike books.

Who Can Be Affected?

Convergence insufficiency can occur in both children and adults.

It is commonly noticed in:

• School-aged children

• Teenagers

• University students

• Adults who spend long hours on computers

• People returning to work after a concussion or head injury

Many children are unaware that what they are experiencing is unusual because they have never known anything different.

How Is Convergence Insufficiency Diagnosed?

A routine eyesight test alone may not detect convergence insufficiency.

During a comprehensive eye examination, Dr Cheryl Lee will assess how well your eyes work together, including:

• Eye alignment

• Near point of convergence

• Eye movements

• Focusing ability

• Binocular vision

• Stereopsis (depth perception)

These tests help determine whether your symptoms are caused by convergence insufficiency or another eye condition.

Treatment

The good news is that convergence insufficiency is often highly treatable.

Treatment may include:

• Vision therapy exercises

• Home convergence exercises

• Prism glasses in selected cases

• Correcting any underlying spectacle prescription

• Managing associated dry eye symptoms if present

• Regular review of progress

Treatment is individualised depending on your age, symptoms and examination findings.

Can Convergence Insufficiency Be Prevented?

Although convergence insufficiency cannot always be prevented, healthy visual habits may reduce symptoms:

• Take regular breaks during reading and screen use.

• Follow the 20-20-20 rule.

• Ensure good lighting when reading.

• Maintain a comfortable reading distance.

• Encourage children to spend time outdoors and balance screen time with other activities.

Can convergence insufficiency occur together with myopia?

Yes. A child can have both myopia and convergence insufficiency. While glasses correct blurred distance vision, they do not treat problems with eye coordination. If a child continues to experience headaches, eyestrain or reading difficulties despite wearing the correct glasses, an assessment of binocular vision may be recommended.