| Kyu Ryong Choi | 4 Articles |
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[English]
The nerve fiber birefringence imaged by the scanning laser polarimetry ophthalmoscope per-mits the nerve fiber laser to be distinguished from the rest of the retina. The Nerve fiber Analyzer(LDT,Inc) resolves the nerve fiber layer thickness to a reproducibility of 10um. To evaluate the direct measurements of the retinal nerve fiber layer in normal glaucoma eyes, I have used the NFA. Retardation is higher in 15 normal subject than 75 glaucoma suspect & glaucome eyes, thickness of NTG eyes are significantly(p<0.05) less than those of POAG. With these quantitative measurements, it may be possible to monitor glaucomatous progression by detecting the changes and damage of nerve fiber layer. However, it may requeire to eliminate spurious measurememnt in areas of peripapillary atrophy, and reduce operator input in image acquisition(focus, patient alignment and eveness of illumi-nation).
[English]
To evaluate the effects of Nd : YAG Laser posterior capsulotomy, I performed posterior capsulotomy on after cataract(72 eyes) by using Q-switched Nd:YAG laser from March 1994 to August 1995. The results were as follows; 1) 24 aphakic eyes(33.3%), 45 ECCE with PCL inserted pseudophakic eyes(62.5%), 3 KPE with PCL inserted pseudophakic eyes(4.2%) were followed. 2) On performing posterior capsulotomy, the power setting of Nd:YAG laser was ranged from 2.0 to 2.9mJ(62.5%), more than 40 pulses were used in 35 eyes(48.6%). 3) Postoperative visual acuity was improved in 68 eyes(94.4%) and 0.5 or better in 47 eyes(65.3%) 4) Ocular complications after posterior capsulotomy were transient increase of intraocular pressure(8.3%), sustained increased intraocular pressure(4.2%), anterior uvetis(2.8%), vitreous prolapse(2.8%), corneal damage(2.8%), intraocular lens damage(1.4%), cystoid macular edema(1.4%), retinal detachment(1.4%). As the results, posterior capsulotomy with the Nd : YAG laser offers several advantages over primary or secondary surgical capsulotomy and has fewer complications.
[English]
Over the past 17 years, the number of medical research papers in the Ewha Medical Journalhas increased. And the use of statistics to evaluate experimental and clinical research data has increased. We observed statistical methods used in 730 articles from the Ewha Medical Journalfor a 17 year period(from 1978 to 1995). The most commonly used method was measurementof central tendency with t-test, χ2-test, ANOVA, correlation analysis and regression analysis(74.8%). The second most common method was χ2-test with t-test, ANOVA, pearson correlation(9.2%), fo11owed by epidemiological statistics(7.6%). The observed errors of statistical method in 314 original aricles were 585 spells(repeat No./paper). The most common error was that of no significant value and confidence interval(18.4%), followed by misuse of SE instead of SD(15.5%). Misuses of applicating statistical method included the use of the t-test instead of ANOVA incomparing three groups(0.2%) and the use of the student t-test instead of paired t-test and vice versa.
[English]
Laser iridectomy with combined application of the argon and the Nd-YAG laser was perfomed on 48 eyes with narrow angle glaucoma. Patients were followed for from minimum 3months to maximum 18 months and were evaluated the success rate of iridectomy patency, thepostoperative intraocular pressure(after 3 months), the number of application and the postoperative complications. In this study, the results obtained are as follows: 1) Patency rates of iridectomy site were 87.5%. 2) Postoperative intraocular pressure was well controlled except 3 cases after 3 months later(19mmHg>), and the number of prophylactic contralateral healthy eye was 17. 3) Postoperative complications were transient eccentric pupil, corneal bum, mild iritis andhyphema,lOP spiking and localized anterior capsular opacity. Additional laser iridectomy were needed in 4 cases and trabeculertomy were 2 cases.
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