Qualitative assessment of ultrasound biomicroscopic images using standard photos——the Liwan Eye Study

蒋宇振   何明光   PAUL FOSTER

中山大学中山眼科中心   National Institute for Heath Biomedical Research Centre for Ophthalmology，UCL Institute of Ophthalmology and Moorfields Eye Hospital   510060

Objective：To classify anatomical features related to anterior chamber angles by a qualitative assessment system using ultrasound microscopy(UBM).

Method:This study comprised primary angle-closure suspects(PACS)eyes defined by the pigmented trabecular meshwork being invisible in two or more quadrants on static gonioscopy(cases).Subjects who did not meet this criterion were defined controls.All subjects underwent UBM.A set of standard images were used to qualitatively classify iris thickness，iris convexity，iris angulation，ciliary body size and ciliary process position.

Results:The difference in overall iris thickness between cases(n=117)and controls(n=57)was not statistically significant.The peripheral iris tended to be thicker in all quadrants of controls.A flat iris was more commonly seen in controls，and was rare in the cases.No significant differences were found between cases and controls in the qualitative classifications of other anatomical features.

Conclusions:Basal iris thickness was more relevant to narrow angle configuration than overall iris thickness.Other features related to angle configuration were comparable in cases and controls.