1. if a person really has PACG what is the probability that the intraocular pressure test will detect it?

2. if a person really does not have PACG what is the probability that the torch light test correctly results in a negative prediction (no PACG)?

3. the population prevalence is 2.8%. calculate the positive predictive value of torch light test.

Shows sensitivity, specificity of intraocular pressure, torch light test and van Herick test Test Sensitivity (%) Specificity (%) Intraocular pressure 47 92 Torch light test 80 70 van Herick test 61.9 89.3