《Table 4 Calculate the diagnostic sensitivity and specificity of ACA using gonioscopy as the gold st

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《Dual Scheimpflug imaging as a screening method for occludable angles-a comparison with gonioscopy》

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ACA:Anterior chamber angle.Sensitivity（true positive rate）=89%；Specificity（true negative rate）=58%；Positive predictive value=38%；Negative predictive value=94%；Accuracy=8.45；Likelihood ratio for positive test=2.11.A cut-off value of 29°was used for ACA

Forty eyes of 40 patients were prospectively enrolled.The study included 31（78%）eyes of patients graded as open-angle and 9（23%）eyes as narrow-angle，based on gonioscopy.The mean age of the patients was 61±11y（range，20-86 years old）.The female-male ratio was 3:1.The average ACA according to noncontact morphometry with dual Scheimpflug（Galilei G6）was 28.7°±3.5°（range，21.4°-35°）.For specific groups ACA mean was 29.6°±3.3°for open-angle eyes and 25.6°±2.6°for narrow-angle（P=0.0008）.Figure 1 illustrates the Galilei image for both open and narrow angles.ACV and ACD measures were also statistically distinct among the 2 groups（P<0.0001；Table 1）.