Postoperative changes of anterior chamber depth and lens suspensory ligament in patients with ultra-high myopia and cataract and related influencing factors / 国际眼科杂志(Guoji Yanke Zazhi)

AIM:To investigate the changes of anterior chamber depth(ACD)and lens suspensory ligament after phacoemulsification and intraocular lens(IOL)implantation in patients with ultra-high myopia cataract and related influencing factors.METHODS: A total of 45 patients(60 eyes)with ultra-high myopia and cataract in our hospital from October 2016 to December 2022 were selected. All patients received phacoemulsification and IOL implantation. The patients were randomly divided into implantation group and non-implantation group. Implantation group was combined with capsular tension ring(CTR)implantation, and non-implantation group did not implant CTR during operation. The changes of ACD and lens suspensory ligament length before and after operation were compared and the correlation was analyzed. To observe the differences of ACD and the length of lens suspensory ligament between the two groups before and after operation.RESULTS: The ACD of patients with ultra-high myopia complicated with cataract at 1 and 3mo after operation was higher than that before operation(all P<0.05). The positions of 3:00, 6:00, 9:00, 12:00 and the average length of lens suspensory ligament at 1 and 3mo post-operation were shorter than those pre-operation(all P<0.05). There was no significant difference in the positions of 3:00, 6:00, 9:00, 12:00 and average length of suspensory ligament between 1mo and 3mo after operation(all P>0.05). The preoperative average length of lens suspensory ligament in patients with ultra-high myopia cataract was positively correlated with the ocular axis and the preoperative ACD(all P<0.05). There was no significant difference in ACD between the implantation group and the non-implantation before and at 1 and 3mo after operation(P>0.05). There was no significant difference in the length of lens suspensory ligament between implantation group and non-implantation group at the position of 6:00 before operation and 1mo after operation(P>0.05), but there was difference in lens suspensory ligament between groups at 3mo after operation and the position of 6:00(P<0.05). Furthermore, there was no significant difference at the positions of 3:00, 9:00, 12:00 and the average length of lens suspensory ligament between the implantation group and non-implantation group before and at 1 and 3mo after operation(P>0.05).CONCLUSION: The ACD deepen and lens suspensory ligament shortened in patients with ultra-high myopia and cataract after phacoemulsification; the length of lens suspensory ligament was affected by the combined use of CTR.

Changes of Anterior Chamber Depth and Angle After Cataract Surgery Measured by Anterior Segment OCT

PURPOSE: To report the change of anterior chamber parameters according to cataract severity after cataract surgery and to determine its relationship to the severity of cataract by using anterior segment optical coherence tomography. METHODS: We measured the anterior chamber parameters in 19 eyes of 14 patients before, 1 week after, and 1 month after cataract surgery by slit lamp-adapted optical coherence tomography (SL-OCT). The measured parameters were as follows : the anterior chamber depth (ACD), the angle-opening distance 250 micrometer from the scleral spur (AOD250), the angle-opening distance 500 micrometer from the scleral spur (AOD500), and the trabecular-iris angle (TIA). We analyzed the relationship between the severity of cataract and the change of the anterior chamber parameters. RESULTS: The ACD, AOD250, AOD500, and TIA increased significantly at postoperative 1 week (P=0.000, 0.002, 0.005, 0.022) and 1 month (P=0.000, 0.004, 0.001, 0.002). The preoperative parameters were negatively correlated with the differences between the postoperative 1 week and preoperative parameters (gamma=-0.834, -0.591, -0.421, -0.826) and between postoperative 1 month and preoperative parameters (gamma=-0.659, -0.700, -0.770, -0.821). The change of parameters at postoperative 1 week (by N P=0.959, 0.916, 0.824, 1.000, by C P=0.454, 0.665, 0.578, 0.578) and 1 month (by N P=0.858, 0.973, 0.959, 0.959, by C P=0.999, 0.207, 0.950, 0.981) were not significantly different according to the severity of cataract (N, C). CONCLUSIONS: Our results showed that cataract surgery significantly deepened the anterior chamber and widened its angle. The shallower and narrower the preoperative anterior chamber depth and angle were, respectively, the greater the postoperative changes of anterior chamber depth and angle were.

Changes in Ciliary Sulcus Size, Anterior Chamber Depth and Angle during Accommodation using Ultrasound Biomicroscopy

PURPOSE: To evaluate changes in the ciliary sulcus size, anterior chamber depth (ACD) and anterior chamber angle (ACA) during accommodation using an ultrasound biomicroscope (UBM). METHODS: Twenty-seven eyes of 27 healthy subjects were studied. We examined refractive error and intraocular pressure, measured the horizontal distance of the ciliary sulcus, ACD, and ACA at distant fixation and near fixation using a UBM (50 MHz transducer, model P45 UBM plus, Paradigm(R), Kent, U. K.). RESULTS: The subjects included 16 males and 6 females. The mean age of the subjects was 20.5 years (age range, 19-22 years), and mean spherical equivalent was -2.86+/-1.67 diopters. At distant fixation, horizontal ciliary sulcus size was 11.75+/-0.56 mm, ACD was 3.15+/-0.17 mm, and ACA was 38.5+/-4.2 . At near fixation, horizontal ciliary sulcus size was 11.34+/-0.65 mm, ACD was 2.92+/-0.15 mm, and ACA was 44.5+/-5.7 . CONCLUSIONS: During accommodation, horizontal ciliary sulcus size and ACD significantly decreased and ACA increased in the patients.