The Effect of Posterior Vitreous Detachment on Visual Prognosis in Branch Retinal Vein Occlusion

The common causes of visual loss in branch retinal vein occlusion[BRVO] have been reported as the macular edema, macular non-perfusion and the vitreous hemorrhage due to neovascularization.These factors have close relationship with the status of the posterior vitreous. The purpose of this study was to evaluate the factors of visual prognosis in BRVO and the relationship between visual prognosis and vitreomacular status.Fifty-two patients with branch retinal vein occlusion in the department of ophthalmology, Yeungnam University college of Medicine were included for vitreo macular examination.The eyes were classified as two groups, vitreomacular attachment[Group I]and posterior vitreous detachment[Group II]. The incidence of macular edema was significantly lower in eyes with group I [Fisher's exact Test:p<0.05].Final visual acuity was better than the initial visual acuity, regardless of the presence of posterior vitreous detachment [Paired t-test:p<0.01].Group I developed higher rate of neovascularization and vitreous hemorrhage, but statistical significance was not noted.

Clinical Outcome after Implantation of Intraocular Lens in Pediatric Cataract

Safety and effect of intraocular lens implantation in pediatric cataract patients were studied. And properness of intraocular lens along postoperative refractive changes was evaluated. In the department of ophthalmology, Yeung-Nam University college of medicine, twenty-eight patients were performed lens aspiration with intraocular lens implantation for pediatric cataract from May 1992 to October 1996. Preoperative and postoperative visual acuity, refractive power and postoperative complication along operative methods were evaluated, retrospectively. After follow up period of 6-30 months(mean 17.7 months), visual improvement more than 2 lines was noted 28 eyes(77.8%) by Hahns visual acuity chart. The trends of myopic shift had no significance in statistically, it is proper that we selected intraocular lens power adjust to emmetropia in over 3 years old patients. The difference between preoperative and postoperative refractive power measured within 0 and -2 Diopters in 30 eyes(83%). Aimed intraocular lens power was calculated by using SRK/T fomula for emmetropia and adjustment for refractive error of fellow eye. Best corrected vision was obtained after medical treatment of amblyopia.

Surgical Effect of Medpor in the Reconstruction of Orbital Wall Fracture

The records of the patients with the orbital wall fracture were reviewed from January 1985 through December 1994 in the Department of Ophthalmology, Yeungnam University Medical Center. Eighteen patients were repaired orbital wall fracture using Medpor and 44 patients were repaired orbital wall fracture using silicone plate. Surgical effect of Medpor was evaluated and compared with that of silicone plate in the reconstruction of orbital wall fracture. Postoperative improvement of diplopia, extraocular muscle movement, enophthalmos and complications were evaluated after the follow-up period of 6 months. The incidence of the orbital fracture was more common in men than in women(p0.05). the improvement of enophthalmos were 1.2mm in case of Medpor and 1.1mm in silicone plate, but the difference between the two materials was insignificant(p>0.05). Six cases (33%) of the Medpor group and the nine cases (20%) of the silicone plate group caused the infraorbital hypoesthesia, but there was no significant diference between the two groups(p>0.05). Prolapse of the implant was noted in one case of silicone plate implantation, but it was not found in any case of Medpor implantation yet. Postoperative complications such as retrobulbar hematoma, optic nerve injury and lower eyelid retraction were not noted in the two procedures. In this study, Medpor revealed similar surgical effect as silicone palte in reconstruction of orbital wall fracture. However, Medpor has a remarkable characteristic of fibrovascular ingrowth keeping from prolapse or dislocation. Therefore it could be the most ideal implant for the repair of the orbital wall fracture at present.