Department of Glaucoma, Anand Eye Institute, 7-147/1, Nagendra Nagar, Habsiguda, Hyderabad, Telangana, India.
Indian J Ophthalmol. 2022 Dec;70(12):4471. doi: 10.4103/ijo.IJO_1487_22.
As perimetry is a psychophysical test, the thresholds obtained are not only dependent on the functional architecture of the visual system but also on a variety of physical and cognitive factors. Factors such as, Lens rim artifact, improper refraction, miosed pupil and blepharoptosis, can affect luminance thresholds. Additionally, cognitive factors such as patient's attention, motivation, fatigue, and response bias can influence the obtained thresholds.
The video describes identification of various artifacts in Humphrey visual field printout and it has some useful teaching points to recognize and learn.
Visual field test is critical for assessment and to document progression of glaucoma, but is prone to errors and artifacts. Fortunately, the patterns of such artifactual field loss are often characteristic and easily recognizable.
Several types of errors can lead to inaccurate results. Proper instructions and patient supervision during the test helps to improve the test results. The technician should ensure correct patient's data entry. Careful examination of the obtained data on the printout is essential to detect any errors that can lead to misinterpretation of visual field, false alarms, and wrong clinical conclusion.
由于视野检查是一种心理物理学测试，因此获得的阈值不仅取决于视觉系统的功能结构，还取决于各种物理和认知因素。例如，镜片边缘伪影、屈光不正、瞳孔缩小和眼睑下垂等因素会影响亮度阈值。此外，认知因素，如患者的注意力、动机、疲劳和反应偏差，也会影响获得的阈值。
该视频介绍了识别 Humphrey 视野打印结果中各种伪影的方法，其中包含一些有用的教学要点，可帮助识别和学习。
视野检查对于评估和记录青光眼的进展至关重要，但容易出现错误和伪影。幸运的是，这些人为的视野缺失模式通常具有特征性且易于识别。
几种类型的错误可能导致结果不准确。在测试过程中，正确的指导和患者监督有助于提高测试结果。技术人员应确保正确输入患者的数据。仔细检查打印结果中的获取数据对于检测可能导致对视野的误解、误报和错误临床结论的任何错误至关重要。
