Jones Pete R, Smith Nicholas D, Bi Wei, Crabb David P
Division of Optometry and Visual Science, School of Health Sciences, City, University of London, London, UK.
Transl Vis Sci Technol. 2019 Feb 5;8(1):17. doi: 10.1167/tvst.8.1.17. eCollection 2019 Jan.
Visual field (VF) examination by standard automated perimetry (SAP) is an important method of clinical assessment. However, the complexity of the test, and its use of bulky, expensive equipment makes it impractical for case-finding. We propose and evaluate a new approach to paracentral VF assessment that combines an inexpensive eye-tracker with a portable tablet computer ("Eyecatcher").
Twenty-four eyes from 12 glaucoma patients, and 12 eyes from six age-similar controls were examined. Participants were tested monocularly (once per eye), with both the novel Eyecatcher test and traditional SAP (HFA SITA standard 24-2). For Eyecatcher, the participant's task was to simply to look at a sequence of fixed-luminance dots, presented relative to the current point of fixation. Start and end fixations were used to determine locations where stimuli were seen/unseen, and to build a continuous map of sensitivity loss across a VF of approximately 20°.
Eyecatcher was able to clearly separate patients from controls, and the results were consistent with those from traditional SAP. In particular, mean Eyecatcher scores were strongly correlated with mean deviation scores ( = 0.64, < 0.001), and there was good concordance between corresponding VF locations (∼84%). Participants reported that Eyecatcher was more enjoyable, easier to perform, and less tiring than SAP (all < 0.001).
Portable perimetry using an inexpensive eye-tracker and a tablet computer is feasible, although possible means of improvement are suggested.
Such a test could have significant utility as a case finding device.
通过标准自动视野计（SAP）进行视野（VF）检查是临床评估的重要方法。然而，该测试的复杂性以及其使用的笨重、昂贵设备使其在病例筛查中不切实际。我们提出并评估一种用于旁中心视野评估的新方法，该方法将廉价的眼动追踪器与便携式平板电脑（“Eyecatcher”）相结合。
对12例青光眼患者的24只眼和6例年龄相仿的对照者的12只眼进行检查。参与者单眼进行测试（每只眼一次），同时进行新型Eyecatcher测试和传统的SAP（HFA SITA标准24 - 2）。对于Eyecatcher测试，参与者的任务仅仅是看着一系列固定亮度的点，这些点相对于当前注视点呈现。起始和结束注视点用于确定刺激可见/不可见的位置，并构建跨越约20°视野的敏感度损失连续图。
Eyecatcher能够清晰地将患者与对照者区分开来，结果与传统SAP的结果一致。特别是，Eyecatcher的平均得分与平均偏差得分高度相关（ = 0.64， < 0.001），并且相应视野位置之间具有良好的一致性（约84%）。参与者报告称，Eyecatcher比SAP更有趣、更易于操作且更不累人（所有 < 0.001）。
使用廉价眼动追踪器和平板电脑的便携式视野检查是可行的，不过也提出了可能的改进方法。
这样的测试作为一种病例筛查设备可能具有重要用途。
