| 摘要 |
A holder (2) is attached to the head of the person under test, aligned in a plane in the field of view. Locating objects (6,6',6) are arranged on the holder in a plane within the field of view so that they can be seen by the eye. The last (6') in the series of locating objects is arranged in the outer edge region of the field of view. The last locating object can be moved through 90 degrees to the side.
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