ABSTRACT
Objective:To observe the changes in the anterior chamber before and after cataract surgery by ultrasound biomicroscopy (UBM) in eyes with primary angle closure glaucoma. Methods: Ultrasound biomicroscopy was used for anterior chamber imaging in 78 eyes of 50 patients with primary angle closure glaucoma before and 1 month after cataract phacoemulsification and intraocular lens implantation. And the intraocular pressures were recorded at the same time. Results: UBM allowed the imaging of the entire anterior eye segment. In the images, the differences between iris thickness (IT), iris zonule distance (IZD) and iris lens angle (?2) before and after the operation were statistically insignificant. After the operation, marked increases were observed in the anterior chamber depth (ACD), angle opening distance at 500 ?m from the scleral spur (AOD500), trabecular iris angle (?1) and trabecular ciliary process distance (TCPD), with statistically very significant differences from preoperation (P
ABSTRACT
Objectives: To observe ultrastructural changes of the corneal endothelium and to assess the significance of the changes after irrigation and aspiration(I/A) of the anterior chamber in rabbits. Methods: Corneal thickness and intraocular tension were measured and the ultrastructure of corneal endothelium was observed in scheduling times following I/A. Results:Obvious injury of the membrane structure of corneal endothelium was viewed with scanning electron microscope 1 day after injury. Transmission electron microscope revealed marked swelling of the organelles, increasing vacuoles in the cytoplasm and swelling, denuding, dissolving of the cellular nuclei 3 days after injury. The lipoballs resulted from aggregation of lipid in the cellular membrane adhered to the defect region of endothelium 5 days after injury. Scanning electron microscope displayed marked sign of migration of the corneal endothelium 7 days following injury. The corneal endothelium was heteromorphic and the degeneration of the epithelium occurred. The corneal thickness gradually increased and directly related to the degree of the corneal muddiness. The corneal thickness increased and the injury of endothelium aggravated when intraocular tension increased. Conclusions:The results of ultrastructural examination indicated that destruction of the corneal endothelium following injury seems to be a consequential sequel. Dynamic corneal thickness measurement contributes to the judgement of degree of corneal endothelium injury. Control of intraocular tension is one of the important methods for preventing secondary injury of the corneal endothelium.
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Objectives: To evaluate the efficacy of phacoemulsification and foldable IOL implantation with limbal tunnel incision. Methods: A 3.2mm limbal tunnel incision was made on 72 eyes of 66 patients with senile, complicated and traumatic cataract. Phacoemulsification and foldable IOL implantation was performed. Visual acuity, corneal curvature and corneal topography were measured after the surgery. Results: One day, one week and one month after the surgery, visual acuity exceeded 0.5 in 69.4%, 80.6%,86.1% of the patients respectively. One week after the surgery, the mean astigmatism was (1.85±0.89)D(P<0.01), 0.30 D more than that before the surgery. Corneal topography showed that the incision was steep or flat. One month after the surgery, the mean astigmatism was (1.48±1.02)D，P>0.05,corneal topography had recovered. Conclusions: Phacoemulsification and foldable IOL implantation with limbal tunnel incision have comparatively simple, with less postoperative inflammation and faster recovery of visual acuity.