When can you have vision therapy on a lazy eye?

As soon as possible. Earlier treatment for amblyopia usually results in improved outcomes. Therefore, early identification of the problem and treatment is essential especially in children.
As early as you can. The child's brain can adapt to changes much better at a younger age. In fact, after the age of 7, it becomes increasingly difficult to resolve a lazy eye. Vision therapy alone may not be the answer. Surgery may be of more benefit, depending on the cause of the lazy eye. The earlier treatment begins, the better the final outcome will be.

Related Questions

Can vision therapy treat lazy eye?

Generally no. Vision therapy is an untested procedure, advocated by "vision therapy optometrists". It has never been subjected to clinical trials and more experienced clinicians feel that it is of no benefit. For adults with a 'lazy' eye, it is definitely not worth doing. Read more...