1.Estimaionof Intraocular Lens Power in Penetration Keratoplasty Combined with Intraocular Lens Implantation.
Jae Kun CHO ; Sung Bum HONG ; Eung Kweon KIM ; Beung Sup PARK
Journal of the Korean Ophthalmological Society 1998;39(11):2628-2634
The corneal triple procedure is that penetrating keratoplasty, extracapsular cataract extraction, and posterior chamber intraocular lens implantation are performed simultaneously and preoperative prediction of intraocular lens implant power is necessary to achieve the desired postoperative refractive status in eyes undergoing the triple procedure. Therefore we evaluated the important factors in determining intraocular implant power patients undergoing the triple procedure. A retrospective study was done on 12 eyes of 11 patients who underwent triple procedure between March 1993 and April 1997. Mean age was 52.9 years and mean follow-up period was 26.3 month(range, 4 to 53 months). The Mean postoperative spherical equivalent was -0.98+/-4.05D. Forty-two percents of patients were within +/-2.00D of emmetropia. The important factors in determining intraocular lens power of patients undergoing the triple procedure are axial length, corneal curvature, refractive status of the fellow eye, and donor/recipient size. If these values are unreliable, it is desirable for the corneal srurgeon to use mean axial length and mean corneal curvature to determine the intraocular implant power. The important factors in determining intraocular lens power of patients undergoing the triple procedure are axial length, corneal curvature, refractive status of the fellow eye, and donor/recipient size. If these values are unreliable, it is desirable for the corneal surgeon to use mean axial length and mean corneal curvature to determine the intraocular implant power.
Cataract Extraction
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Corneal Transplantation*
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Emmetropia
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Follow-Up Studies
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Humans
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Keratoplasty, Penetrating
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Lens Implantation, Intraocular*
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Lenses, Intraocular*
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Retrospective Studies
2.Performance Evaluation of LG HBsAg Confirm Kit.
Beung Sup SUNG ; Soo Jin YOO ; Heung Bum OH ; Byung Kap HWANG ; Mi Jin SOHN
Korean Journal of Blood Transfusion 2001;12(2):197-204
BACKGROUND: The specificity of HBsAg enzyme immunoassay (EIA) has been previously reported between 95% and 100% for blood donor screening in Korea. Considering that Korea is highly endemic in HBV infection, it is highly recommended that blood donors showing true positive for HBsAg were permanently deferred from donation. Identification of false-positive results by a confirmation assay would be a necessary step for this purpose. This study was intended to evaluate LG HBsAg Confirm (LG Chemicals Corp., Seoul, Korea) kit as a confirmation test and know the positive predictive value for HBsAg screening results. METHODS: LG HBsAg Confirm reactivities were evaluated in 279 patients and 185 blood donor samples, all of which were positive in HBsAg EIA. Patients samples were positive in both HBsAg EIA and HBV DNA. Confirm positive was determined according to the following 2 step criteria: (1) the percent neutralization is 50% or more (first-step neutralization), or (2) if not, the percent neutralization after 1:1,000 dilution of original sample is 50% or more (second-step neutralization). RESULTS: LG HBsAg Confirm kit confirmed all 279 patients~ sera as positive. All of 185 blood donor samples showed true positive results. First-step neutralization confirmed 157 sera (33.8%) as positive and second-step neutralization confirmed 307 sera (66.2%) among 464 samples. CONCLUSION: Performance of LG HBsAg Confirm was so excellent that all the samples showing positive in both HBsAg EIA and HBV DNA tests could be determined as confirm positive.
Blood Donors
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DNA
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Hepatitis B Surface Antigens*
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Humans
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Immunoenzyme Techniques
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Korea
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Mass Screening
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Neutralization Tests
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Sensitivity and Specificity
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Seoul