Byeonghun Ahn

It is important to investigate the incidence of congenital color deficiency and to determine the type and degree because the color deficiency can effect as a handicap to certain occupations. The incidence of congenital color deficiency is remarkably constant among Caucasians but other races show considerable variations. We investigated the incidence of congenital color deficiency among Koreans by the use of H-R-R pseudoisochromatic plates. The present study revealed that the incidence of congeni

The discriminant criteria used had high sensitivity and specificity in the diagnosis of glaucoma and the TopSS can be useful in the early detection of changes in the glaucomatous optic disc.

The development of POAG may be associated with the abnormal expression of gelatinase A in aqueous humor.

In order to compare the clinical efficacy of expanded polytetrafluoroethylene membrane-tube implant (MT implant) and Ahmed implant in the treatment of refractory glaucoma, the medical records of the patients who had been followed-up for more than 1 year after glaucoma implant surgery were reviewed retrospectively. Either MT or Ahmed implants were selected randomly and implanted by one surgeon in patients with refractory glaucoma. There was no significant difference in clinical variables such as

BACKGROUND: The background of this study is to introduce the surgical technique and outcomes of a novel membrane-tube (MT) type glaucoma shunt device (MicroMT), which was developed to achieve safer and more predictable intraocular pressure (IOP) control compared with conventional trabeculectomy. DESIGN: This is a retrospective, non-comparative, interventional case series study. PARTICIPANTS: The MicroMT was implanted in 43 glaucomatous eyes with insufficient IOP control despite medical treatment

Purpose: Recently established in 1997, Sungkyunkwan University School of Medicine was the first medical school in Korea to adopt problem-based learning (PBL) as a core curriculum from the very beginning. The purpose of this study was to evaluate the PBL curriculum from the viewpoint of the medical students. Methods: This study used a qualitative approach to understand students' perceptions of the positive aspects of PBL. A total of 22 second-year medical students at Sungkyunkwan medical school

The long-term postoperative refractive outcomes of phacotrabeculectomy and phacoemulsification alone were not significantly different in eyes with OAG, regardless of preoperative AL.

Standardized patients (SPs) are either persons who are trained to simulate a patient's illness in a standardized way or actual patients. Newly established Sungkyunkwan University School of Medicine started problem based learning (PBL) curriculum and SP program has been developed for teaching and evaluating clinical skills in medical education. Standardized patients were recruited from the community. Small-group SP training sessions were operated by two SP trainers and supervised by a clinical fa

Our case series suggests that the SR-AID provides an efficient and safe means of access to the subretinal space.

The small diameter tubes of 100 and 200 μm internal diameters, with 7-0 and 5-0 nylon intraluminal stents, respectively, used in the MT-type glaucoma shunt device showed safe and effective outflow characteristics.

Purpose: To report a case of late-onset bleb-associated endophthalmitis caused by <i>streptococcus cristatus</i> (<i>S. cristatus</i>) after trabeculectomy.Case summary: A 59-year-old woman presented with left ocular pain and visual disturbance. She had undergone trabeculectomy of the left eye 2 years ago. At the initial visit, she was only able to count fingers from the left eye. Whitish thin bleb, conjunctival injection, and inflammation were observed in the left anteri

Our previous experimental work with tissue plasminogen activator (TPA) suggested the possibility of the clearance of vitreous hemorrhage by repetitive injections of low-dose TPA. We therefore investigated in rabbits the effect of both repeated injections of TPA and the change of the integrity of the vitreous body on the clearance of vitreous hemorrhage. Vitreous hemorrhage was produced by intravitreal injection of 0.05 ml of autologous whole blood in the pigmented rabbit eyes with intact vitreou