Biosciences Institute, Newcastle University, Newcastle upon Tyne, UK.
Faculty of Psychology, Universidad Complutense de Madrid, Madrid, Spain.
Ophthalmic Physiol Opt. 2020 Nov;40(6):815-827. doi: 10.1111/opo.12737. Epub 2020 Sep 29.
In 2019, we described ASTEROID, a new stereotest run on a 3D tablet computer which involves a four-alternative disparity detection task on a dynamic random-dot stereogram. Stereo thresholds measured with ASTEROID were well correlated with, but systematically higher than (by a factor of around 1.5), thresholds measured with previous laboratory stereotests or the Randot Preschool clinical stereotest. We speculated that this might be due to the relatively large, sparse dots used in ASTEROID v0.9. Here, we introduce and test the stereo thresholds and test-repeatability of the new ASTEROID v1.0, which uses precomputed images to allow stereograms made up of much smaller, denser dots.
Stereo thresholds and test/retest repeatability were tested and compared between the old and new versions of ASTEROID (n = 75) and the Randot Circles (n = 31) stereotest, in healthy young adults.
Thresholds on ASTEROID v1.0 are lower (better) than on ASTEROID v0.9 by a factor of 1.4, and do not differ significantly from thresholds on the Randot Circles. Thresholds were roughly log-normally distributed with a mean of 1.54 log arcsec (35 arcsec) on ASTEROID v1.0 compared to 1.70 log arcsec (50 arcsec) on ASTEROID v0.9. The standard deviation between observers was the same for both versions, 0.32 log arcsec, corresponding to a factor of 2 above and below the mean. There was no difference between the versions in their test/retest repeatability, with 95% coefficient of repeatability = 0.46 log arcsec (a factor of 2.9 or 1.5 octaves) and a Pearson correlation of 0.8 (comparable to other clinical stereotests).
The poorer stereo thresholds previously reported with ASTEROID v0.9 appear to have been due to the relatively large, coarse dots and low density used, rather than to some other aspect of the technology. Employing the small dots and high density used in ASTEROID v1.0, thresholds and test/retest repeatability are similar to other clinical stereotests.
2019 年，我们描述了 ASTEROID，这是一种在 3D 平板电脑上运行的新立体测试，涉及动态随机点立体图上的四项替代视差检测任务。使用 ASTEROID 测量的立体阈值与以前的实验室立体测试或 Randot 学前临床立体测试所测量的阈值高度相关，但系统地更高（约 1.5 倍）。我们推测这可能是由于 ASTEROID v0.9 中使用的相对较大、稀疏的点。在这里，我们引入并测试了新的 ASTEROID v1.0 的立体阈值和测试/复测可重复性，该版本使用预计算的图像来允许由更小、更密集的点组成的立体图。
在健康的年轻成年人中，测试并比较了新旧版本的 ASTEROID（n=75）和 Randot 圆（n=31）立体测试之间的立体阈值和测试/复测可重复性。
ASTEROID v1.0 的阈值比 ASTEROID v0.9 低（更好）约 1.4 倍，与 Randot 圆的阈值没有显著差异。阈值大致呈对数正态分布，ASTEROID v1.0 的平均值为 1.54 对数弧秒（35 弧秒），而 ASTEROID v0.9 的平均值为 1.70 对数弧秒（50 弧秒）。两种版本的观察者之间的标准偏差相同，均为 0.32 对数弧秒，这相当于平均值上下的 2 倍。两个版本之间的测试/复测可重复性没有差异，95%的可重复性系数为 0.46 对数弧秒（2.9 倍或 1.5 个倍频程），Pearson 相关系数为 0.8（与其他临床立体测试相当）。
之前使用 ASTEROID v0.9 报告的较差立体阈值似乎是由于相对较大、粗糙的点和低密度使用造成的，而不是技术的其他方面。使用 ASTEROID v1.0 中的小点点和高密度，阈值和测试/复测可重复性与其他临床立体测试相似。
