Convergence Insufficiency

Convergence Insufficiency

Did you know that children with AD(H)D are 3 times more likely to have Convergence Insufficiency?

Convergence Insufficiency is one of the most common eye disorders affecting reading and learning. It is not a problem with the muscles of the eyes or the nerves, but rather in how the brain controls the eye position (software problem instead of hardware problem). The good news is that vision therapy is proven to be the most effective treatment (CITT study).

Here are a few signs and symptoms common to Convergence Insufficiency:
  • eyestrain (especially with or after reading)
  • headaches
  • blurred vision
  • double vision
  • inability to concentrate
  • short attention span
  • frequent loss of place
  • squinting, rubbing, closing or covering an eye
  • sleepiness during the activity
  • trouble remembering what was read
  • words appear to move, jump, swim or float
  • problems with motion sickness and/or vertigo

For many patients the main symptom is an avoidance of near-work activities. As with other visual issues, it is not a condition that is always ‘felt’ in the eyes. Frequently, if a child is having difficulty completing work up close and/or has trouble staying on these tasks due to discomfort, there is a mis-diagnosis of ADD/ADHD. In fact, one study found that children who had been diagnosed with ADD/ADHD were three times more likely to have convergence insufficiency (Granet DB, Gomi CF, Ventura R, Miller-Scholte A. The relationship between convergence insufficiency and ADHD. Strabismus. 2005;13:163–8. [PubMed]. )


Smile The 2008 Convergence Insufficiency Treatment Trial [Link to CITT study] demonstrated
that Vision Therapy provided the largest success rate and best resolution of symptoms.
The trial demonstrated that home therapy or the classic ‘pencil pushups’ were not an
adequate treatment. Some doctors will still prescribe the classic ‘pencil pushups’
because unfortunately the latest research has not reached everyone. In fact the CITT
study proved that pencil pushups were as effective as the placebo.

For more information, please visit our Helpful Links page.
To book an examination or inquire about convergence insufficiency treatment in Victoria, please contact us.

Browse Our Education Sections

Vision and Reading/Attention

Vision and Reading/Attention

Did you know that 80% of problem readers are deficient in 1 or more visual skills?  Seeing clearly is only one of 17 visual skills needed for reading and learning. ...

Refractive Error

Refractive Error

Hyperopia (farsighted) As a general rule this means that these individuals use some focus power to see in the distance, and even more for up close. Myopia (nearsighted) ...



Amblyopia Commonly referred to as a ‘lazy eye’, amblyopia can come in different forms, but is a problem with a lack of development of communication between the eye and ...

What is Vision?

What is Vision?

Is seeing clearly (20/20) really enough? Did you know that being able to see clearly is only a small part of what makes up your vision? In fact, there are closer to 17 ...

  • This field is for validation purposes and should be left unchanged.


T: 250.590.7384

F: 250.412.6459

American Patients: 1.347.554.1719

E: [email protected]

A: 734 Caledonia Avenue.
Victoria BC V8T 1E5


Sunday: Closed*

Monday: 9:00am - 5:00pm

Tuesday: 10:00am - 6:00pm

Wednesday: 10:00am - 6:00pm

Thursday: 10:00am - 6:00pm

Friday: 9:00am - 5:00pm

Saturday: 10:00am - 5:00pm

*Hours above do not reflect therapy hours.

McCrodan Vision Development Clinic Tour

Website Design & Development By: Harrington Creative