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In the context of duction testing, which evaluates the movement of one eye independently of the other, if a patient has a restricted right medial rectus muscle (RMR), it specifically affects the ability of the right eye to move inward towards the nose, a movement known as adduction.

The medial rectus muscle is responsible for adducting the eye, and if it is restricted or weakened, the right eye will struggle or be unable to move in that direction. Therefore, during duction testing, a lack of ability to adduct the right eye would be a clear indicator of the restriction in the medial rectus muscle function.

Understanding this relationship helps to diagnose and manage potential strabismus or binocular vision disorders, as deficiencies in specific muscle functions directly correlate with the movement abilities of each eye.