Objective: To determine the reliability and validity of the flashlight test and van Herick's test in detecting occludable anterior chamber angles.Methods:The flashlight test, van Herick's test and gonioscopy were performed independently by two observers on 96 consecutive new patients in our outpatient clinic. lnterobserver agreement was determined using the weighted Kappa statistic. Using the glaucoma specialist's assessment of occludability of the angle (assessed by gonioscopy) as a gold standard, the sensitivities and specificities of the two tests were calculated.Results: All three tests showed good agreement (Kappa more than 0.75). The sensitivity and specificity of the flashlight test were 45.5% and 82.7% respectively. For the van Herick's test they were 61.9% and 89.3%. Conclusion:The flashlight test and van Herick's test are of limited use as screening tests for occludable angles.

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A larger number of normal eyes obeyed the IST rule compared with the ISNT rule for the RNFL thickness measured by HRT and OCT. Exclusion of the nasal sector from the analysis (IST rule) marginally improved the specificity in diagnosing glaucoma at the cost of the sensitivity, making neither of these parameters (ISNT and IST) likely to be useful clinically.

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