【摘要】 目的 介绍新开发的动态视力评估软件DVA-Ⅰ,并进行初步临床应用研究。方法 设计符合动态视力检测要求的评估软件,并选取37例受试者参加临床试验性测量,通过DVA-Ⅰ软件呈现大小分别为9 pt及6 pt的旋转视标,测量受试者在1 m远处所能分辨的视标最大转速及识别速度。结果 软件运行结果稳定。所有受试者可分辨的9 pt视标转速高于6 pt视标[(131.76±17.37)r/min vs (115.54±37.73)r/min,P=0.005],9 pt视标辨认时间少于6 pt视标[(15.35±12.16)s vs (23.77±13.41)s,P=0.000]。不同性别及不同屈光状态组间可辨认的动态视标最大转速及辨识速度的差异均无统计学意义(P>0.05)。结论 DVA-Ⅰ型动态视力评估软件可准确测量受试者的动态视觉分辨能力及分辨速度,并可通过有效控制环境因素减小对测量结果的影响,是一项具有临床应用前景的运动视觉辅助设备。
【关键词】 动态视力;评估;DVA-Ⅰ软件;运动视觉
The introduction of dynamic visual acuity assessing software DVA-Ⅰ and the study of its clinical application
XU Wei, XU Jingjing, BAO Jinhua, et al.
School of Optometry and Ophthalmology, Wenzhou Medical College, Wenzhou China, 325027
[Abstract] Objective To introduce a new software DVA-Ⅰ and to approve its clinical feasibility in dynamic visual acuity assessing. Methods A specific software for DVA testing and recording was developed. Thirty-seven subjects were examined one meter away from the DVA facility. The DVA-Ⅰ system presented 9 pt and 6 pt size targets respectively in the maximum rotary velocity and recorded the time cost of identification from the subjects. Results The DVA-Ⅰ ran smoothly and friendly. All of the subjects showed easier and quicker identification when reading 9 pt targets than that in 6 pt targets [(131.76±17.37)r/min vs (115.54±37.73)r/min, P=0.005, (15.35±12.16)s vs (23.77±13.41)s, P=0.000]. However, there were no significant differences between male and female subjects, neither between emmetropes and myopes (P>0.05). Conclusion DVA-Ⅰ system has the capability of detecting dynamic high speed rotated targets and accurate time cost for identification. Meanwhile it effectively controls the external noise factors around DVA testing. It will provide a helpful sports vision assessment in clinic.
[Key words] dynamic visual acuity; assess; DVA-Ⅰ software; sports vision
动态视力是指当观察者与视觉目标之间有相对位移时,分辨物体细节的能力[1],通常将它定义为个体能够正确地辨识移动中物体细微部分的一种运动视觉能力,又称为动体视力。许多运动相关的视觉任务均包含对动态视力的需求[2]。大量研究证实,动态视力的好坏直接影响运动状态下工作任务的完成质量[3],故在体育运动视觉领域中得到了较大的关注。尤其在运动员的筛选与能力预测或提高方面,动态视力的检测有助于及时发现相关视觉问题,并可通过针对性的训练提高成绩[4]。
动态视力检测的开展有数十年的历史,测量方式多样化,结果差异甚大且缺乏可比性,如国外曾使用的Kirschner Rotator、Motorized Pegboard Rotator、Micromedical Technologies、Dynamic I llegible E Test[1],中国台湾地区运动员测量用的ATHLEVISION动体视力检测软件[5]及内地驾驶员检测使用的动态视力测试仪等[6-7],因此有必要开创一种评定客观、标准统一,能完整定义适宜环境、视标、仪器及测试方法等因素的新型动态视力测量和评估方法。我们综合以往各种传统动态视力检测设备的优点,并结合计算机模拟动态视标,进一步规范检测标准,设计开发了一套使用简便的新型动态视力评估软件DVA-Ⅰ,并投入临床进行初步应用检测,现报告如下。
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