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The recent article by Donahue et al¹ is a fine contribution, but I must protest the accreditation ("was established") of the test "to identify the paretic muscle responsible for an acute cyclovertical strabismus" to Marshall M. Parks, MD, in the first sentence. Dr Parks is responsible for "the 3-step test" and many other advances in strabology. I have the greatest respect and affection and personal gratitude for Dr Parks.

But the statement that he "established", ie, is responsible for, this is not true or at least misleading. What do you mean by "established"?

More than a century ago, there was a major problem in strabismus diagnosis. In vertical strabismus, after versions and ductions, there was no way to determine which cyclovertical muscle was weak: a left hypertropia increasing on right gaze could be a palsied left superior oblique or right superior rectus. Historically, according to von Noorden,² there was no . . . [Full Text of this Article]