| 摘要 |
The apparatus and method comprise means to evaluate the interocular latency difference known to exist in individuals afflicted with multiple sclerosis. The apparatus includes two horizontal rows of 10 light emitting diodes separated by a horizontal partition. The upper row of diodes is seen by the eye and a lower row of diodes is seen by the other eye. Although the two rows are separated vertically, they are made to overlap optically and appear as one row by means of two periscopic eye pieces. The ten diodes in each field of view are energized (strobed) sequentially for 1/10 of the time required to scan a horizontal row. The directions of scanning in the two rows are opposite to each other. A separate diffraction line ruling is placed in each optical path to produce elongated diffraction images of each energized diode in one row which are at 45 degrees to the horizontal and at right angles to the elongated diodes in the other row. When the diodes in the same positions of the upper and lower rows are energized simultaneously, an "X" image of elongated diodes appears as a full and stationary pattern. At other locations, the diffracted elongated diodes appear to rotate about the center dot. The ability to distinguish these patterns at preselected positions was found to be a valuable test for multiple sclerosis.
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