Objective To evaluate the reliability and validity of the Mars numeral contrast sensitivity test and to explore whether it can be used in the examination of contrast sensitivity in low vision patients. Methods This was a prospective comparative study. Eighty-three subjects (83 eyes) were divided into two groups: a normal vision group, 40 young adults without significant eye diseases whose habitual vision was better than 0.8, and a low-vision group, 43 low-vision patients whose better eye’s visual acuity ranged from 0.05 to 0.3. Subjects were tested with their corrected visual acuity. ①The first examiner randomly selected three Mars numeral contrast sensitivity charts and recorded the contrast sensitivity scores after testing. ②Subjects were tested randomly by the first examiner with one of three forms of the Mars numeral contrast sensitivity charts and the Mars letter contrast sensitivity charts. The contrast sensitivity scores were recorded for each test. ③The second examiner used the same procedure used by the first examiner to test subjects and record contrast sensitivity scores. Repeatability and reproducibility were assessed based on intersession within-subject standard deviations (Sw), precision (1.96Sw), coefficient of variation (CVw), and intraclass correlation coefficient (ICC). The agreement between the Mars numeral contrast sensitivity test and the Mars letter contrast sensitivity test was evaluated by Pearson correlation analysis, ICC and Bland-Altman analysis. Results Repeatability and reproducibility: the Mars numeral contrast sensitivity test showed excellent repeatability and reproducibility, with a lower 1.96Sw, CVw, and high ICC values (higher than 0.75). Agreement between the Mars numeral contrast sensitivity test and the Mars letter contrast sensitivity test: there was excellent agreement between the two tests based on a high correlation (r=0.995, P<0.01), high ICC (0.997), and narrow 95% LoA confidence intervals (-0.053,0.092)logCS. Conclusion The Mars Numeral Contrast Sensitivity Test can be used for low-vision testing based on its high reliability and validity.
吴志毅,许梅萍,李小曼,陈洁,瞿佳. 数字式Mars对比敏感度检查表在国人低视力患者中的应用[J]. 中华眼视光学与视觉科学杂志, 2013, 15(8): 459-462.
WU Zhi-yi, XU Mei-ping, LI Xiao-man,CHEN Jie,QU Jia. The Mars numeral contrast sensitivity test for use in low-vision Chinese patients. Chinese Journal of Optometry Ophthalmology and Visual Science, 2013, 15(8): 459-462. DOI: 10.3760/cma.j.issn.1674-845X.2013.08.003
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