Visual acuities as measured with an automatic intelligent visual acuity chart projector and standard logarithmic visual acuity chart: a prospective comparative study.
Mingyue Luo, Xinyu Liu, Dingding Zhang, Youxin Chen, Weijuan Kang
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引用次数: 0
Abstract
Purpose: This study aimed to test the repeatability of visual acuity (VA) measurement using an novel intelligent projector visual acuity (IP) chart (LSJ-IVAC-6000A, Hunan Liangshi Jia Biotechnology Co., Ltd.) and the consistency of VA measurement between the IP chart and the 5 m standard logarithmic visual acuity (SL) chart (GB11533-2011).
Methods: In this prospective comparative study, 53 subjects were included to test the internal repeatability of the IP chart. Both eyes of the subjects were tested three times, with a minimum interval of 10 min. The intraclass correlation coefficient (ICC) was used to evaluate the repeatability. One hundred subjects were included to test the consistency between two charts. Both eyes of the subjects were tested with two charts in random order with an interval of 10 min for each test. ICC and the Bland-Altman statistical analyses were used to analyze the consistency of the two charts. VA values were expressed by the logMAR recording method. The time consumption for each test was recorded in seconds.
Results: In the repeatability analysis, the ICC values of the right and left eye were 0.968 (95% CI, 0.950-0.981, p < 0.001) and 0.964 (95% CI, 0.944-0.978, p < 0.001), respectively. In the consistency analysis, the ICC values of the right and left eye were 0.946 (95% CI, 0.919-0.963, p < 0.001) and 0.817 (95% CI, 0.727-0.877, p < 0.001), respectively. However, the 95% limits of agreement (LoA) of the differences in the VA measurements between the IP and SL chart for the right and left eye were -0.26 to 0.31 and -0.34 to 0.39, respectively, suggesting a certain degree of instability in the measurements of the SL chart. There was no significant difference in the time consumption of VA measurements between the two charts (p = 0.668). In the consistency analysis of subgroups by age, the ICC values were >0.8 (p < 0.001) in the most groups except for the left eyes of 51-70 years old subgroup which had an ICC value of 0.448 (95% CI, -0.919 to 0.841, p = 0.17), with 95% LoA of -1.02 to 0.77.
Conclusion: The IP chart demonstrated good repeatability and overall consistency with the SL chart.
期刊介绍：
Frontiers in Medicine publishes rigorously peer-reviewed research linking basic research to clinical practice and patient care, as well as translating scientific advances into new therapies and diagnostic tools. Led by an outstanding Editorial Board of international experts, this multidisciplinary open-access journal is at the forefront of disseminating and communicating scientific knowledge and impactful discoveries to researchers, academics, clinicians and the public worldwide.
In addition to papers that provide a link between basic research and clinical practice, a particular emphasis is given to studies that are directly relevant to patient care. In this spirit, the journal publishes the latest research results and medical knowledge that facilitate the translation of scientific advances into new therapies or diagnostic tools. The full listing of the Specialty Sections represented by Frontiers in Medicine is as listed below. As well as the established medical disciplines, Frontiers in Medicine is launching new sections that together will facilitate
- the use of patient-reported outcomes under real world conditions
- the exploitation of big data and the use of novel information and communication tools in the assessment of new medicines
- the scientific bases for guidelines and decisions from regulatory authorities
- access to medicinal products and medical devices worldwide
- addressing the grand health challenges around the world
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