Journal List > J Korean Ophthalmol Soc > v.58(2) > 1010702

Kee and Yang: Repeatability and Validity of the VAA-2000 Automated Self Vision Tester

Abstract

Purpose

To evaluate the test-retest reliability and validity of the VAA-2000 Self Vision Tester.

Methods

A total of 108 eyes of 108 adults (55 men and 53 women) who visited Seoul National University Bundang Hospital from March to December 2015 and who had best corrected visual acuities of 20/200 or better, according to both Hahn’s visual acuity test (using numbers and Landolt rings) and the VAA-2000 Self Vision Tester, were included. The test-retest reliability and validity of the VAA-2000 Self Vision Tester were assessed and compared with Hahn’s visual acuity test performed using numbers and Landolt rings. The intraclass correlation, Pearson correlation, Bland-Altman plots, and Deming regression between the different tests were analyzed.

Results

The average best corrected visual acuity was 0.12 ± 0.17 logMAR measured with the VAA-2000 Self Vision Tester, and was 0.08 ± 0.20 logMAR with Hahn’s visual acuity test using numbers and 0.08 ± 0.30 logMAR using Landolt rings. The VAA-2000 Self Vision Tester demonstrated high test-retest reliability (intraclass correlation coefficient = 0.903, p < 0.001) and acceptable validity when compared with Hahn’s visual acuity test using numbers (r = 0.767, p < 0.001) and Landolt rings (r= 0.727, p < 0.001).

Conclusions

The VAA-2000 Self Vision Tester possesses good reliability and acceptable validity when compared to Hahn’s vis-ual acuity test using numbers and Landolt rings.

References

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Figure 1.
VAA-2000 Self Vision Tester. (A) Overall view. (B) Joy stick of the VAA-2000 Self Vision Tester.
jkos-58-203f1.tif
Figure 2.
Test– retest variability represented as Bland– Altman plots. Upper and lower dotted lines show 95% limits of agreement with 95% confidence intervals. (A) Bland-Altman plots for comparison between initial and repeated tests (test-retest agreement) of the VAA-2000 Self Vision Tester. (B) Bland-Altman plots for comparison between visual acuities measured by the Hahn’s number chart and the VAA-2000 Self Vision Tester. (C) Bland-Altman plots for comparison between visual acuities measured by the Landolt Ring visual acuity chart and the VAA-2000 Self Vision Tester. SD = standard deviation.
jkos-58-203f2.tif
Table 1.
Test-retest agreement of initial and repeated measurements of the VAA-2000 Self Vision Tester, and between the Hahn’s visual acuity number chart, Landolt Ring visual acuity chart and the VAA-2000 Self Vision Tester
Model Mean difference 95% CI for the mean SD differences Correlation coefficient
Initial– Repeated VAA measurement (logMAR) 0.12 -0.02, -0.00 0.00 0.903
Hahn number chart– Initial VAA measurement (logMAR) -0.04 -0.07, -0.02 0.03 0.770
Landolt Ring– Initial VAA measurement (logMAR) -0.07 -0.12, -0.02 0.11 0.727

CI = confidence interval; SD = standard deviation.

Table 2.
Deming regression analysis for proportional and systematic bias between initial and repeated measurements of the VAA-2000 Self Vision Tester, and between the Hahn’s visual acuity number chart, Landolt Ring visual acuity chart and VAA-2000 Self Vision Tester
Model Deming regression slope (SE) 95% CI slope
Initial (y)– Repeated VAA measurement (x) (logMAR) 0.99 (0.04) 0.91, 1.09
Hahn number chart (y)– Initial VAA measurement (x) (logMAR) 1.16 (0.22) 0.72, 1.61
Landolt Ring (y)– Initial VAA measurement (x) (logMAR) 1.67 (0.53) 0.62, 2.72

SE = standard error; CI = confidence interval.

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