Liu Lu, Xu Lingxian, Wang Junyue, Wu Huang
Department of Optometry, Second Hospital of Jilin University, Changchun, China.
Hospital of Stomatology, Jilin University, Changchun, China.
J Ophthalmol. 2021 Dec 23;2021:5258782. doi: 10.1155/2021/5258782. eCollection 2021.
Owing to the limitations of printed stereoacuity tests, the effects of luminance and contrast on stereopsis have not yet been sufficiently investigated, despite its important implications in designing stereoacuity measuring instruments, particularly for electronic devices. A stereopsis measurement system was established using two 4 K smartphones and a phoropter to evaluate the effects of luminance and contrast variations on the stereoacuity test. Seventeen young subjects with normal visual acuity and stereopsis were recruited. Two types of test symbols, contour-based and random-dot-based, were used in the experiment. Four series tests were established with different maximum brightness values, including 240 lux, 120 lux, 60 lux, and 30 lux. Each series test contained 19 pages with different contrasts between 95% and 5% and was calculated using the Michelson contrast formula. No significant difference was found for both contour-based and random-dot-based stereograms in any of the contrast groups with different maximum brightness. Similarly, no significant difference was found between contour-based and random-dot-based patterns under different contrasts of above 35%. As the contrast decreased below 30%, the stereopsis was significantly better in the contour-based pattern than in the random-dot-based pattern for some degrees of contrast. The luminance and contrast of the digital display are not critical factors for stereoacuity under normal circumstances. This implies that a standard monitor with a certain 3D technology can be used to measure the stereoacuity threshold without calibrating the luminance and contrast.
由于印刷体立体视锐度测试存在局限性，尽管亮度和对比度对立体视觉的影响在设计立体视锐度测量仪器（特别是电子设备）方面具有重要意义，但尚未得到充分研究。使用两部4K智能手机和一个综合验光仪建立了一个立体视测量系统，以评估亮度和对比度变化对立体视锐度测试的影响。招募了17名视力和立体视正常的年轻受试者。实验中使用了两种类型的测试符号，即基于轮廓的和基于随机点的。建立了四个系列测试，其最大亮度值不同，包括240勒克斯、120勒克斯、60勒克斯和30勒克斯。每个系列测试包含19页，对比度在95%和5%之间变化，并使用迈克尔逊对比度公式计算。在任何具有不同最大亮度的对比度组中，基于轮廓的和基于随机点的立体图均未发现显著差异。同样，在高于35%的不同对比度下，基于轮廓的和基于随机点的图案之间也未发现显著差异。当对比度降低到30%以下时，对于某些对比度程度，基于轮廓的图案中的立体视明显优于基于随机点的图案。在正常情况下，数字显示器的亮度和对比度不是影响立体视锐度的关键因素。这意味着具有某种3D技术的标准显示器可用于测量立体视锐度阈值，而无需校准亮度和对比度。
