Qiu L, et al. - Researchers examined how appositional angle closure (AppAC) is correlated to the conversion of primary angle closure (PAC) into primary angle closure glaucoma (PACG) after laser peripheral iridotomy (LPI). In this prospective cohort study of consecutive patients with PAC, they analyzed the eyes that had undergone LPI with five or more reliable visual field tests in at least 5 years. When the trabecular meshwork and iris were located appositionally on the ultrasound biomicroscopy image at baseline, diagnosis of AppAC was made. Assessment of 128 patients at baseline was done; the inclusion criteria were fulfilled by 80 eyes of 58 patients. In more than 5 years after LPI, conversion of 25% of PAC eyes of Chinese patients into PACG eyes was reported. PAC conversion was noted to be correlated to AppAC > 2 quadrants, older baseline age and higher vertical cup-to-disc ratio.