Though prisms are effective they are not as effective as vision therapy and may result in adaptation problems so that more prism is necessary in the future to alleviate symptoms. Every Optometric and Ophthalmological textbook agrees that the primary treatment of convergence insufficiency should be vision therapy. Vision therapy should be the first source of treatment unless the eye turn is very large. In the case that surgery should be performed it should be followed up with vision therapy. Remember, surgery may lessen the work load but it does not reinforce the eyes working together.
Many surgical patients have their strabismus come back in the future.
Many surgical patients have multiple surgeries without lasting positive results. Newsletters are sent out less than five times a year.