Sanabria O, Feuer W J, Anderson D R
Bascom Palmer Eye Institute, Department of Ophthalmology, University of Miami School of Medicine, FL 33101.
Ophthalmology. 1991 Jan;98(1):76-8. doi: 10.1016/s0161-6420(91)32338-8.
During automated perimetry with the Humphrey Visual Field Analyzer, field examinations are labeled unreliable whenever the reported rate of fixation loss is 20% or more. The reported rate of fixation loss results in part from times when the patient's gaze drifts from the fixation point during the examination, but also in part from technical artifacts such as faulty initial localization of the blind spot or false-positive responses by the patient. It was found that technical artifacts caused nearly half of the instances in which a field examination had a reported fixation loss rate of greater than 20%. It was also found that the perimetrist can prevent the artifacts, with the result that the frequency of field examinations labeled as having excessive fixation loss fell from 26% to 14%.
使用 Humphrey 视野分析仪进行自动视野检查时，只要报告的固视丢失率达到 20% 或更高，视野检查就会被标记为不可靠。报告的固视丢失率部分源于患者在检查过程中目光从固定点漂移的情况，但也部分源于技术伪差，如盲点初始定位错误或患者的假阳性反应。研究发现，在视野检查报告的固视丢失率大于 20% 的情况中，近一半是由技术伪差导致的。还发现，视野检查者可以预防这些伪差，结果是被标记为固视丢失过多的视野检查频率从 26% 降至 14%。
