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.
Romano PE. The Credit for the Head Tilt Test for Cyclovertical Extraocular Muscle Palsies at Least Belongs to Bielschowsky, If Not Also Hofmann and Nagel. Arch Ophthalmol. 1999;117(11):1572. doi: