AS-OCT measurements
TIA
CORNEA, TIA
Before and after laser therapy, all enrolled patients were examined in a dark room with swept-source AS-OCT (DRI Triton, Topcon) to measure anterior chamber angle parameters. The sitting patient placed the head onto the chinrest and adjusted the eye position. During the examination, the patient’s eyelids were gently pulled to expose the corneal limbus. The linear scanning mode of the AS-OCT (wavelength 1050 nm) was used to obtain images of the anterior chamber angle at 12, 6, 3, and 9 o’clock. The scanning range was 6 mm centred on the limbus of the cornea with 64 superimpositions. Only pictures that clearly showed the scleral process were selected for analysis. The built-in ImageJ software (National Institutes of Health, Bethesda, MD, USA) was used for image processing to measure the AOD 500/750 and TIA500/750. First, the scleral spur, which is the point where the curvature of the corneoscleral interface changes, was manually identified as point A (Fig. 
Method of measuring parameters of the anterior chamber angle based on DRI Triton (Topcon, Tokyo, Japan) swept anterior segment optical coherence tomography. AOD: anterior opening distance;  TIA: trabecular iris angle