Objective To observe the effect of preservation of an terior lens capsule on the incidence of complications associated with silicone oil. Methods Eighty-two patients(82 eyes)accepted trans pars plana vitrectomy combined with lensectomy,30 eyes with preservation of an terior lens capsule (PAC) and 52 eyes with no preservation of anterior capsule(N PAC)were observed.The incidence of complications was analysed to investigate whe ther PAC could reduce the complications associated with the usage of tamponade of silicone oil. Results The incidence was 50.0% in NP AC group,and 23.3% in PAC group(0.010lt; Plt; 0.025).There were secondary glaucoma(21.1%),band keratopathy(13.5%)and corneal decompensation(9.6%)in NPAC group,while there was none of them in PAC group. Conclusion Preservation of anterior lens capsule is an effective measure to reduce the complicaltons associated with the tamponade of silicone oil. (Chin J Ocul Fundus Dis, 2001,17:41-43)
The lamina cribrosa (LC) is a complicated collagenous meshwork of trabeculae and laminar pores contain capillaries, nerves and neurogliocytes, which provides structural and nutrient support to the retinal ganglion cell axons as they exit the eye. The intraocular pressure causes direct damage or deformation and remodeling of LC, leads to axoplaxmic transport and blood supply disturbance. The preponderance of evidence suggests that LC is the principal site of glaucomatous damage. The development of optic coherence tomography (OCT) technology has improved the imaging quality of deep structures of the optic nerve head and makes it possible to detect LC. The quantitative research indexes of LC structure include LC depth, laminar curvature, laminar thickness, prelaminar tissue, laminar pore, laminar defect and hemodynamics. To improve the understanding of LC structure, explore the characteristics of LC and understand the biomechanical and hemodynamic pathogenesis of glaucoma, which would be contribute to the application of big data research in the diagnosis and treatment of glaucoma.
Objective To observe the location of the watershed zones of the choroidal blood supply relative to the optic disc in glaucoma by indocyan ine green angiography, and to investigate the mechanisms in the development of glaucomatous neuropathy. Method Simultaneous ICGA and FFA were performed on 31 eyes of 31 patients with glaucoma (17 of POAG, 14 of NTG) and 37 eyes of 37 control subjects. The watershed zones were classified into three types according to their location relative to the optic disc: by type I, no water shedzone around the optic disc; type II, the optic disc surrounded partially by watershed zone; type III, the optic disc surrounded completely by watershed zone. Each of the watershed zone types was scored (i.e., type I=1, type II=2, type III=3). Results In 87.1% of the glaucomatous eyes , the watershed zones included or partially included the optic disc. However, the figure in the control group was 56.8%. The glaucoma group had a higher score of watershed zone type than the control group. Conclusions The mechanisms in the development of glaucomatous neuropathy are correlative to the choroidal blood supply around the optic disc. (Chin J Ocul Fundus Dis，2004，20：218-220)