Publications by authors named "Young Cheol Yoo"
Purpose: To compare long-term postoperative refractive outcomes between phacotrabeculectomy and phacoemulsification, both with posterior chamber intraocular lens implantation.
Setting: Department of Ophthalmology, Konyang University, Kim's Eye Hospital, Myung-Gok Eye Research Institute, Seoul, South Korea.
Design: Retrospective comparative study.
Purpose: To investigate the relationship between retinal nerve fiber layer (RNFL) defects and the quadrant and proximal location of disc hemorrhages (DHs) in a large population examined for health screening.
Methods: A total of 168,044 subjects older than 20 years underwent a single screening ophthalmic examination with color fundus photography as part of a comprehensive health screening program. The presence and location of DHs and RNFL defects were assessed.
Purpose. To evaluate the short-term effect of standard automated perimetry (SAP) testing on intraocular pressure (IOP) in patients with open-angle glaucoma (OAG). Methods.
View Article and Find Full Text PDFPurpose: To evaluate the point-wise relationships between visual field sensitivity (VFS), as measured by standard automated perimetry (SAP), and macular thickness, as determined by spectral-domain optical coherence tomography (SD-OCT), in patients with glaucoma.
Materials And Methods: One hundred and six glaucoma subjects (one eye per subject) recruited from an academic institution underwent SAP tests (Humphrey field analyzer, central 24-2 of Swedish Interactive Thresholding Algorithm standard) and SD-OCT volume scans (SPECTRALIS, posterior pole asymmetry analysis). The retinal sensitivities of 16 central test points from the SAP results were recorded.
Purpose: To compare the ability of time-domain optical coherence tomography (OCT) to detect diffuse and localized retinal nerve fiber layer (RNFL) defects using a built-in normative database in patients with early to moderate glaucoma.
Methods: Subjects with localized visual field defects confined to either hemifield were consecutively recruited. Only 1 eye per subject was considered.
Purpose: To investigate the effect of axial length on the peripapillary retinal nerve fiber layer (RNFL) distribution and the risk of misdiagnosing normal subjects when using the instrument's built-in normative database.
Methods: Healthy young volunteers underwent ophthalmologic examinations including RNFL thickness analysis with spectral-domain optical coherence tomography (OCT), autorefraction, and axial length measurement. The average RNFL thickness values reported along the calculation circle for whole circle, quadrants, and clock hours were recorded and evaluated at the 5% probability level for significant disparities in comparison with the built-in RNFL database.
PURPOSE. Retinal nerve fiber layer (RNFL) thickness measured by optical coherence tomography (OCT) can be unreliable in the presence of a myopic tilted disc. The purpose of this study was to investigate the influence of the calculation circle location of spectral domain (SD)-OCT when measuring RNFL thickness in healthy subjects with myopic tilted disc.
View Article and Find Full Text PDFPurpose: To investigate the influence of angular width and peripapillary position of localized retinal nerve fiber layer (RNFL) defects on their detection by the time-domain optical coherence tomography (OCT).
Methods: Fast RNFL Stratus OCT scans were obtained from 186 eyes of 186 newly detected glaucoma patients with only a single, localized RNFL defect in either eye. The RNFL defects were divided into subgroups according to their angular width at 15° intervals and superior or inferior position.
Purposes: To compare the ability of Stratus optical coherence tomography (Stratus OCT) and scanning laser polarimetry with variable corneal compensator (GDx VCC) in recognizing a localized retinal nerve fiber layer (RNFL) defect identified on red-free fundus photography.
Materials And Methods: Fifty-three patients with only 1 localized RNFL defect in either eye were taken RNFL thickness analysis using Stratus OCT and GDx VCC. Thirty-nine healthy subjects were used as controls and only 1 eye per subject was considered.
Purpose: To compare rebound tonometer and cannulation as methods for measuring intraocular pressure (IOP) in rats.
Methods: The accuracy of the TonoLab rebound tonometer was determined in eight cannulated rat eyes. IOP was manipulated by changing air pressure from 20 to 100 mmHg at 10-mmHg intervals, and the IOP was measured with the rebound tonometer at each level.
Purpose: To investigate the differences in the histopathology and matrix metalloproteinase (MMP) expression in the Tenon's tissue of primary open-angle glaucoma (POAG) patients, primary angle-closure glaucoma (PACG) patients, and non-glaucomatous patients.
Methods: POAG and PACG patients, who underwent a trabeculectomy and had no history of ocular disease except glaucoma, were enrolled. The number and instillation period of topical eye drops were reviewed.
Disc hemorrhages in patients with both normal tension glaucoma and branch retinal vein occlusion in different eyes.
Korean J Ophthalmol
December 2007
Purpose: To document the clinical features of disc hemorrhage in patients with branch retinal vein occlusion (BRVO) and normal tension glaucoma (NTG), and to evaluate the relationship between BRVO and NTG with disc hemorrhages.
Methods: From July 2001 to May 2006, sixteen patients with both NTG and BRVO in different eyes were successively collected from outpatient population of Seoul National University Hospital in this observational case series. The frequency and location of disc hemorrhages, history of associated systemic diseases, and the order of the time of diagnosis between NTG and BRVO were studied.