Virtual Instrument used for the Evaluation of Extraocular Motility

Measuring ocular motility and alignment are essential for the diagnosis of strabismus and diplopia. The conventional methods for obtaining Hess charts can be well replaced with computerized methods having the advantage of a friendly interface and an accurate ophthalmic diagnose. This paper presents a virtual instrument designed to replace the traditional Hess test used for the evaluation of extraocular motility, especially for the measurement of paralytic strabismus. The medical protocol for extraocular motility assessment is described as it is practiced by the medical specialist. The application implementation is made in LabVIEW from National Instruments, a software environment that offers the possibility to establish an optimal and efficient patient-computer-ophthalmologist relationship.