The diagnosis of a vertical ocular muscle imbalance is frequently associated with confusion and loss of time; the etiology of such an imbalance is most likely due to paresis. For these two reasons it is recommended that any diagnostic approach be a preconceived step-by-step method and one which assumes the condition to be paretic until proven otherwise. Such an approach is presented. Following the detection of a vertical muscle imbalance during a routine eye examination, the described method is employed. It consists of a simple "three-point" test which is used with a computer. This device is described. It is a form of digital computer the use of which stimulates a routine approach. Upon completion of the three-point test, it reveals the paretic muscle automatically. Complicated cases require further investigation.
Schwarting BH. Computer Approach to the Diagnosis of Vertical Eye Muscle Imbalance. Arch Ophthalmol. 1968;80(6):754-756. doi:10.1001/archopht.1968.00980050756014