数字减影泪道造影术的应用

目的：评价数字减影泪道造影术在临床检查泪道阻塞中的应用价值。方法：利用数字减影泪道造影术对82只正常眼及56只溢泪眼进行检查。并对图像进行分析。结果：数字减影泪道造影术能够提供清晰的泪道图像并对泪道阻塞的部位及泪道改变作出准确的判断。结论：数字减影泪道造影术是一种快速、有效和无损伤的检查方法。在泪道阻塞的诊断和治疗中将起重要作用。     

术中应用丝裂霉素C预防翼状胬肉术后复发的疗效观察

OBJECTIVE: To explore the feasibility of intraoperative application of mitomycin C (MMC) in pterygium and observe the ultrastructure change of pterygium with or without intraoperative application of MMC. METHODS: Sixty two eyes of 57 patients with primary pterygium were randomly divided into MMC group and control group, 29 patients (32 eyes) in MMC group underwent transposition with intraoperative application of MMC (0.4 mg.ml-1 for 1 minute), whereas 28 patients (30 eyes) in control group underwent transposition. The recurrence rate, complications and side effects were observed and compared between the two groups. The ultrastructure of pterygium with or without intraoperative application of MMC was studied with transmission electron microscopy. The mean follow-up was(7.6 +/- 3.4) months (1-13 minths). RESULT: Eleven eyes of the 30 eyes in control group (36.%) showed recurrence, whereas only 2 of 32 eyes (6.3%) in MMC group showed recurrence (P < 0.005). No severe complication and side effect appeared during the follow-up. Most of fibroblasts in pterygium that underwent intraoperative MMC occurred the change of rough endoplasmic reticulum (RER) dilatation. CONCLUSION: Intraoperative MMC appears to be an effective treatment in preventing recurrence of primary pterygium. The fibroblasts in pterygium have RER dilatation after application of MMC for 1 minute during the operation.     

实行院办院管模式 规范社区服务功能——深圳市龙岗中心医院社区健康服务的实践与探索

在政府的支持下,解放思想、更新观念、大胆探索、勇于实践,以院办院管七个统一为原则,规范社区健康服务六大功能,脚踏实地为社区居民提供有效、经济、方便、综合、连续的基层卫生服务。     

Information limitations in perception of shape from texture

Li and Zaidi (Li, A., and Zaidi, Q. (2000) Vision Research, 40, 217-242) showed that the veridical perception of the 3-dimensional (3D) shape of a corrugated surface from texture cues is entirely dependent on the visibility of critical patterns of oriented energy. These patterns are created by perspective projection of surface markings oriented along lines of maximum 3D curvature. In images missing these orientation modulations, observers confused concavities with convexities, and leftward slants with rightward slants. In this paper, it is shown that these results were a direct consequence of the physical information conveyed by different oriented components of the texture pattern. For texture patterns consisting of single gratings of arbitrary spatial frequency and orientation, equations are derived from perspective geometry that describe the local spatial frequency and orientation for any slant at any height above and below eye level. The analysis shows that only gratings oriented within a few degrees of the axis of maximum curvature exhibit distinct patterns of orientation modulations for convex, concave, and leftward and rightward slanted portions of a corrugated surface. All other gratings exhibit patterns of frequency and orientation modulations that are distinct for curvatures on the one hand and slants on the other, but that are nearly identical for curvatures of different sign, and nearly identical for slants of different direction. The perceived shape of surfaces was measured in a 5AFC paradigm (concave, convex, leftward slant, rightward slant, and flat-frontoparallel). Observers perceived all five shapes correctly only for gratings oriented within a few degrees of the axis of maximum curvature. For all other oriented gratings, observers could distinguish curvatures from slants, but could not distinguish signs of curvature or directions of slant. These results demonstrate that human observers utilize the shape information provided by texture components along both critical and non-critical orientations.     

Elevated vitreous concentration of monoclonal immunoglobulin manifesting as schlieren in juvenile rheumatoid arthritis-associated uveitis

We report the clinical findings and analysis of the immunoglobulin (Ig) composition of the vitreous of a 10-year-old girl with juvenile rheumatoid arthritis-associated uveitis. The vitreous had a schlieren appearance at the time of pars plana lensectomy and vitrectomy. Analysis of the vitreous fluid revealed marked elevation of IgG, IgM, IgA, and albumin levels relative to vitreous fluids from control patients without uveitis. The immunoglobulin coefficients were also elevated for the IgG and IgM classes of immunoglobulins. Immunofixation electrophoresis of the vitreous fluid revealed 2 distinct bands of restricted electrophoretic mobility. These studies suggest that there may be local (intraocular) production of immunoglobulins as an immunologic response in ocular inflammatory diseases such as juvenile rheumatoid arthritis-associated uveitis and that this immunologic response may be monoclonal (possibly biclonal or oligoclonal) in nature.     

Erosion and intrusion of silicone rubber scleral buckle. Presentation and management.

OBJECTIVE: To describe the clinical presentation and management of erosion and intrusion of silicone rubber implants that are used in scleral buckling procedures for the treatment of retinal detachment. METHODS: The authors identified four patients from their practices during the last 20 years (1978-1998) who had erosion or intrusion of silicone rubber scleral buckles that were used to manage retinal detachment. Approximately 4400 scleral buckling procedures were performed during this period. A retrospective review of the medical records of all patients was performed. Factors that influenced management decisions concerning the intruding buckle are emphasized. RESULTS: All four patients had myopia. The interval between placement of the scleral buckle and development of intrusion ranged from 1 to 20 years. The buckles were intrascleral in three cases and episcleral in one. Recurrent detachment and vitreous hemorrhage were indications for surgical intervention in three cases. After the surgical removal of buckling elements, visual acuity stabilized in all patients and the retina remained attached in all cases. CONCLUSIONS: Erosion and intrusion of scleral buckle are rare complications of scleral buckling procedures. The intruding buckle may be left intact unless there is significant threat to the integrity of ocular structures, recurrent detachment, or hemorrhage. Manipulation of the encircling band or buckle does not necessarily alter the visual acuity or the status of the retina.