Dr. Joserine Samson, OD FBCLA offers expert advice on convergence insufficiency
19 November 2018| Last updated on 9 December 2018
Convergence insufficiency is the inability of both eyes to converge and work as a team to maintain single binocular vision and fusion
In this condition, one or both eyes has a tendency to move away from each other whilst reading or doing near work (exophoria at near).
Once one or both eyes do drift out, doubling of vision is experienced by patients. To prevent this, the eyes make extra effort in bringing back single vision, creating a number of frustrating symptoms.
Symptoms Related to Convergence Insufficiency
Patients with Convergence Insufficiency may experience one or more of the following symptoms:
- Blurring of vision—especially after reading or close work
- Eye strain
- Double vision
- Inability to concentrate
- Short attention span
- Frequent loss of place when reading
- Squinting, rubbing or closing/covering one eye
- Words appear to move, jump, swim or float
- Motion sickness or vertigo
Convergence training has been proven to help patients with convergence insufficiency.
Study shows that over all cure rate for patients doing vision therapy is as high as 72%.* Along with better control in convergence and fusion, symptoms such as headaches and blurring of vision at near related to convergence insufficiency are alleviated over time.
Convergence Insufficiency is one of the most undiagnosed condition with regards to visual difficulty. Most visual tests that will confirm this condition are at times overlooked by eye care practitioners in a normal visual assessment. Ask your doctor about it.
*Grisham, JD. Visual therapy results for convergence insufficiency: a literature review. American Journal of Optometry and Physiological Optics. 1988
Authored by Dr. Joserine Samson, OD FBCLA
First Fellow of British Contact Lens Association (BCLA) in the Middle East