System and method for testing dynamic visual acuity and/or gaze stabilization

摘要

A system for testing the vision of a subject is disclosed herein. The system includes a motion sensing device, the motion sensing device configured to measure a velocity or speed of a head of a subject; a visual display device having an output screen, the visual display device configured to display one or more visual objects on the output screen so that the one or more visual objects are visible to the subject; and a data processing device, the data processing device operatively coupled to the motion sensing device and the visual display device, the data processing device being specially programmed to carry out the steps of the vision tests. A method for the testing the vision of a subject is also disclosed herein. The vision tests may assess the dynamic visual acuity and/or the gaze stabilization of the subject.

主权项

1. A system for testing the vision of a subject, said system comprising:
a motion sensing device, the motion sensing device configured to measure a velocity or speed of a head of a subject; a visual display device having an output screen, the visual display device configured to display one or more visual objects on the output screen so that the one or more visual objects are visible to the subject; a data processing device, the data processing device operatively coupled to the motion sensing device and the visual display device, the data processing device being specially programmed to:
display one or more configurations of one or more visual objects having a first initial size on the output screen of the visual display device while the subject maintains a generally fixed position of his or her head;determine whether or not the subject correctly identifies the one or more configurations of the one or more visual objects having the first initial size;incrementally decrease and/or increase the size of the one or more visual objects on the output screen of the visual display device during a first set of successive trials, and determine whether or not the subject correctly identifies one or more configurations of each of the differently sized visual objects during the first set of successive trials while the subject maintains a generally fixed position of his or her head;determine a size parameter of a first threshold version of the one or more visual objects based upon a performance of the subject during the first set of successive trials during which the subject maintains the generally fixed position of his or her head, wherein the determination of the size parameter of the first threshold version of the one or more visual objects does not require the exact distance between the subject and the visual display device to be measured or determined;display one or more configurations of the one or more visual objects having a second initial size on the output screen of the visual display device while the subject's head undergoes displacement at a velocity or speed within a predetermined range as measured by the motion sensing device;determine whether or not the subject correctly identifies the one or more configurations of the one or more visual objects having the second initial size;incrementally decrease and/or increase the size of the one or more visual objects on the output screen of the visual display device during a second set of successive trials, and determine whether or not the subject correctly identifies one or more configurations of each of the differently sized visual objects during the second set of successive trials when the subject's head undergoes displacement at a velocity or speed within the predetermined range as measured by the motion sensing device;determine a size parameter of a second threshold version of the one or more visual objects based upon a performance of the subject during the second set of successive trials during which the subject's head undergoes displacement;compare the size parameter of the second threshold version of the one or more visual objects to the size parameter of the first threshold version of the one or more visual objects; andgenerate a quantitative assessment of dynamic visual acuity loss using the size parameters of the first and second threshold versions of the one or more visual objects.