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What the latest evidence says about Brock String therapy, convergence insufficiency, and spasm of the near reflex

A lot of us have been taught convergence exercises such as Brock String and pencil push-ups at courses related to concussion and vestibular rehabilitation.

Recently, however, concerns have emerged suggesting these exercises may worsen visual dysfunction or even cause permanent damage.

Given this, I thought it would be prudent to revisit the literature and see what the evidence actually says.

The short answer?

Current evidence does not support permanent structural visual or neurological harm from convergence exercises.

In fact, the newest concussion-specific research suggest...

Interest in creatine for concussion recovery continues to grow among clinicians, athletes, and patients looking for strategies to support brain healing. As providers managing concussion, prevention remains foundational. When injury occurs, however, the focus shifts to a key question:

What physiologic environment best supports neurologic recovery?

Evidence-based concussion management emphasizes education, graded return to activity, sleep optimization, autonomic regulation, and targeted rehabilitation. Increasingly, patients also ask about supplements. As a result, clinicians need clarity on whether creatine for concussion recovery is biologically plausible, clinically useful, or still theor...