Measuring changes in Schlemm’s canal and trabecular meshwork in different accommodation states in myopia children: an observational study

摘要

Simulated diagram of experimental set-up and examples of measured items in optical coherence tomography (OCT) image. a A tilted first-surface mirror with a frame carrying a rotation axis was attached to the OCT machine and used to place the fixation stimuli at different vergences. Measurements were obtained on the right eye of the subject while the left eye looked at an optotype through the mirror. The figure depicts a simulated diagram (left), whole-view of the testing system (middle), and large view of the optotype in the mirror (right). b Simulated diagram of the anterior eye segment accounting for measured items in this study: central lens thickness (CLT), pupil diameter (PD), Schlemm’s canal length (SCL), Schlemm’s canal width (SCW), trabecular meshwork length (TML), trabecular meshwork width (TMW), ciliary muscle2 (CM2) and 3 (CM3) mm posterior to the scleral spur, and scleral spur (SS). c OCT image showing measurement methods for CLT and PD. d OCT image showing measurement methods for anterior chamber depth (ACD). e OCT image showing measured part of SC (yellow loop, including SCL and SCW) and TM (green arrow, including TML and TMW). f Image showing measured part of the ciliary muscle (yellow line marks the testing sites of CM2 and CM3, respectively)