less-involved eyes (P=0.001). Although there was no significant difference for the inferior iris attachment of the involved eyes between AACG and CACG groups (P=0.09), the inferior iris in the less-involved eyes of AACG group were attached more anterior (P=0.002). Such a finding of the present study is consistent with that of Yao and coworkers,22 who investigated the frequency of appositional angle closure and related Inhibitors,research,lifescience,medical anatomic characteristics in fellow eyes of patients with AACG after performing laser peripheral iridotomy using ultrasound biomicroscope. In a study of 34 fellow eyes of 34 patients

with AACG, more than one third showed appositional angle closure.15 The authors stated that a narrower angle, a more anterior position of the ciliary body, and a thicker peripheral iris in fellow eyes of AACG after prophylactic laser iridotomy might be associated with an increased risk for progressive

angle Inhibitors,research,lifescience,medical closure. The frequency of narrower angle in the superior quadrants in patients with AACG was greater than those in patients with CACG, though not Inhibitors,research,lifescience,medical statistically significant. This supports previous findings that angle width was narrowest in the superior quadrant.23 This variation in angle width by quadrant has been postulated to be an artifact that is due to gravitational forces in the sitting position and to indentation of the superior cornea by the upper eyelid.24 The least irido-corneal angle observed in superior quadrant of the involved eyes of AACG was 5 degree. The findings suggest that the development of an AACG attack might be associated with specific anatomic structure of the angle. However, it is highly likely that there are other yet unidentified factors that convert narrow Inhibitors,research,lifescience,medical angles to AACG or CACG. Patients in the AACG group had commonly 1+ trabecular pigmentation and in those of CACG group 2+ pigmentation were the most frequent patterns. This can be explained by the possibility of more apposition between iris and trabecular meshwork in the CACG. The findings of the present study Inhibitors,research,lifescience,medical should be interpreted in the light of a number of limitations. The sample size in the AACG group was

small, consisting of only 15 eligible patients. However, given the decline in the prevalence of AACG, performing a study on a larger group of patients seems impractical. Moreover, Tryptophan synthase due to prophylactic laser iridotomy in susceptible patients and timely cataract surgery, which decreases the proportion of people with thick lenses in the population, recruiting patients with AACG before any intraocular Selleck BMS907351 procedure in any study is not easy. However, based on a PubMed search, this is the first study to characterize and compare characteristic gonioscopic anatomical features in patients with AACG and CACG. Additionally, performing gonioscopy by more than one examiner can be regarded as another limiting factor, which is one of the most common ones in all retrospective studies.