目的:最近的工作对视敏度(VA)准确表示婴儿眼震(IN)视觉功能变化的能力提出了质疑。这篇系统的综述调查了影响儿童视觉表现的因素,指导开发VA的合适替代品。
方法:纳入的研究使用实验操作来评估IN患者的视觉功能变化。介入研究,病例系列和病例研究被排除.2023年8月检索了6个数据库。选择,检测,评估了磨损和测量偏差。由于异构的方法,进行了叙事综合。
结果:确定了18篇相关论文,其中11项符合审查标准。文章根据操纵的因素进行分组,以唤起参与者内部的表现变化(运动模糊,心理状态,注视角度或视觉拥挤)。Optotype,image,光栅和移动刺激已经在变化的照明条件和曝光持续时间下使用。
结论:在评估IN的视觉功能时,应考虑影响视觉表现的几个因素。虽然最大VA是一个有用的度量,它的测量故意最小化眼球震颤的特定因素,如视觉表现随凝视角度的变化和“慢看”现象。可以使用零位区测量最大VA,提供无限的观看时间,减少压力/精神负荷和最大限度地减少视觉拥挤。依赖视线的功能视觉空间是一种有前途的措施,可以量化零区的影响,但不考虑时间视觉。尽管尚未证明完整的测量技术,这项审查提供了见解,以指导未来的工作,以开发适当的方法。
OBJECTIVE: Recent work has called into question the ability of visual acuity (VA) to accurately represent changes in visual function in infantile nystagmus (IN). This systematic
review investigated factors affecting visual performance in IN, to guide development of suitable alternatives to VA.
METHODS: Included studies used an experimental manipulation to assess changes in visual function in people with IN. Interventional studies, case series and case studies were excluded. Six databases were searched in August 2023. Selection, detection, attrition and measurement bias were assessed. Due to heterogeneous methodologies, narrative synthesis was undertaken.
RESULTS: Eighteen relevant papers were identified, 11 of which complied with the
review criteria. Articles were grouped according to the factor manipulated to evoke within-participant changes in performance (motion blur, psychological state, gaze angle or visual crowding). Optotype, image, grating and moving stimuli have been employed under varying lighting conditions and exposure duration.
CONCLUSIONS: Several factors affecting visual performance should be considered when assessing visual function in IN. While maximum VA is a useful metric, its measurement deliberately minimises nystagmus-specific factors such as changes in visual performance with gaze angle and the \'slow to see\' phenomenon. Maximum VA can be measured using the null zone, providing unlimited viewing time, reducing stress/mental load and minimising visual crowding. Gaze-dependent functional vision space is a promising measure which quantifies the impact of the null zone but does not consider temporal vision. Although no complete measurement technique has yet been proven, this
review provides insights to guide future work towards development of appropriate methods.