Modified Thorington Card Set

Modified Thorington Test Cards Determines the natural resting position of the eyes. It is used with a transilluminator and a Maddox Rod. Scoring reveals if the patient has normal alignment or if the patient has other than normal alignment, the card helps diagnose uncrossed or crossed diplopia and RhypoP, LhyperP, RhyperP and LhypoP. Each optotype represents one prism diopter. Chart includes one horizontal row and one vertical row of letters.