The Foresee PHP® Exam
During the examination, the patient is presented with a series of dot deviation signals (Figure 1). These dot deviation signals are composed of a collinear set of points and include one or more dots positioned at different locations (artificial distortions). The patient is instructed (Figure 2) to mark on the touch-screen any deviations they may see on the dotted line. Different magnitudes of artificial distortions are presented during the test, to compete with the patient’s actual pathological distortion(s) caused by photoreceptor displacement. If there is a pathological distortion present, and if it is more pronounced than the presented artificial distortion, the patient will “preferentially” pick their own pathological distortion (Figure 4).