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Brian R. Younge, MD; George B. Bartley, MD
Department of Ophthalmology Mayo Clinic Rochester, MN 55905

Arch Neurol. 1987;44(5):472-473.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

To the Editor.

—The controversy over the diagnosis of myasthenia gravis with the Tensilon (intravenous edrophonium chloride) test still rages on. We must take issue with Daroff, a friend and colleague, on his comments on the routine use of the Lancaster red-green test for diagnosing myasthenia gravis.¹ Dr Daroff is a very astute clinician with a tremendous background of research experience in eye movements. Everyone agrees that immediate relief of ptosis or improvement of strabismus under direct observation are the best objective clinical means of confirming a positive response to Tensilon, but the Lancaster red-green test is not as subjective as Daroff implies. A cooperative patient merely superimposes the red and green lights, and in his mind sees only the two overlapping images. The true position of the lights is a direct objective indication of eye position. It is not a measurement of diplopia, although the patient may indeed . . . [Full Text PDF of this Article]

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