- Acute Phase Retinal Phototoxicity Induced by Blue Fluorescent Light.
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Young Hoon Park, Soon Cheol Cha, Duk Kee Hahn
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Yeungnam Univ J Med. 1995;12(1):75-83. Published online June 30, 1995
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DOI: https://doi.org/10.12701/yujm.1995.12.1.75
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- Even though phototherapy is an effective means of treating hyperbilirubinemia, adequate binocular shields are essential to prevent light hazard of retina during phototherapy. The phototherapy to young albino rabbits was performed under various conditions; exposured for 12, 24, and 48 hours, continuity or intermittence of irradiation, and use of shields. Although there was no definite pathologic change in indirect ophthalmoscopic examination, severe damage was seen at electron microscopic level. In all experimental groups, swelling and edema of photoreceptor were seen. at right after phototherapy. Futhermore, more severe damage was seen in case of intermittent irradiated group and prolong exposed group. In mydriatic eyes, severity of damage was similiar to non mydi iatic eyes, but area of retinal damage was more extensive than non-mydriatic eves.. In control group which was protected by binocular shields during phototherapy, no significant abnormality was found.
- Clinical observation of the bilateral branch vein occlusion.
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Young Hoon Park, Duk Kee Hahn, Sang Beon Lee
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Yeungnam Univ J Med. 1993;10(1):77-81. Published online June 30, 1993
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DOI: https://doi.org/10.12701/yujm.1993.10.1.77
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- The clinical evaluation was done in eight eyes of four patients with bilateral branch retinal vein occlusion. The onset of age was from 36 to 65 years, and three pa dents were women. Hypertension was the most common associated systemic disease. Retinal neovascularization was complicated in six eyes, and five eyes had vitreous hemorrhage. The vitrectomy was performed in three eyes. We believe that branch retinal vein occlusion associated with hypertension should be followed carefully in the fellow eyes.
- Spontaneous involution of subfoveal neovascularization.
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Young Hoon Park, Duk Kee Hahn
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Yeungnam Univ J Med. 1991;8(1):252-258. Published online June 30, 1991
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DOI: https://doi.org/10.12701/yujm.1991.8.1.252
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- Majority of the eyes with subfoveal neovascular membrane loss the central vision. We observed two patients who regained significant central vision as the result of the involution of subfoveal neovascularization. On follow-up fundus examination, the subretinal lesions revealed grayish neovascular membranes stained with fluorescein, but did not show the fluid leakage. And subretinal hemorrhage and subretinal fluid were gradually resolved. We assumed that functioning retinal pigment epithelium within the macula and young age were the important factors of the spontaneous improvement of visual outcome.
- Experimental proliferative vitreoretinopathy.
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Young Hoon Park, Bong Hwan Lee, Duk Kee Hahn
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Yeungnam Univ J Med. 1991;8(1):178-190. Published online June 30, 1991
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DOI: https://doi.org/10.12701/yujm.1991.8.1.178
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- The authors performed experimental study to produce proliferative vitreoretinopathy by intravitreal injection of homologous fibroblasts in pigmented rabbits. Twenty four eyes of 12 rabbits were divided into control and experimental groups. In experimental group, the eyes were pretreated with expanding gas, perfluoropropane for the vitrectomy. In control group, no such procedure was preceded. In both groups, 5.0×10⁴, 1.0×10⁵ and 1.5×10⁵ cells of homologous fibroblasts were injected into the vitreous cavity. All the eyes were observed regularly with indirect ophthalmoscope followed by fundus photography. Those eyes were enucleated in 1, 2, 4 weeks for the light and electron microscopic studies. The development and severity of the proliferative vitreoretinopathy were correlated with the numbers of the injected fibroblast. This was more pronounced in the experimental group.
- A Case of Secondary Glaucoma combined with Mesodermal Dysgenesis of Anterior Segment.
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Tae Kwang Ahn, Young Hoon Park, Duk Kee Hahn
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Yeungnam Univ J Med. 1990;7(1):187-190. Published online June 30, 1990
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DOI: https://doi.org/10.12701/yujm.1990.7.1.187
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- The authors experienced a case of secondary glaucoma combined with mesodermal dysgenesis of anterior segment, which disclosed extensive peripheral iridocorneal adhesion of congenital origin while his fellow eye revealed a sclerocornea. This case is extremely rare and entirely different from the previously reported Axenfeld's and Rieger's anomalies. We report this interesting case with brief review of the literatures.
- Intraocular Pressure Changes in the Uneventful Extra-capsular Cataract Extraction and Extra-capsular Cataract Extraction with Vitreous Loss followed by Anterior Chamber Lens Implantation.
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Young Hoon Park, Kyoo Won Lee, Duk Kee Hahn
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Yeungnam Univ J Med. 1989;6(1):81-86. Published online June 30, 1989
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DOI: https://doi.org/10.12701/yujm.1989.6.1.81
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- These days the posterior chamber lens implantation following the extracapsular cataract extraction has become the standard procedure except those patients who cannot take it in one reason or another. In past, however, the anterior chamber lens implantation was popular for sometimes. Even now in those patient complicated by vitreous loss, the anterior chamber lens implantation following anterior vitrectomy is indicated in some cases. We have become interested in the difference of the intraocular pressure change in the patients who underwent the uneventful extra-capsular cataract extraction followed by anterior chamber lens implantation in routine manner and in those whose extra-capsular cataract extraction were complicated by vitreous loss and eventually needed the anterior vitrectomy before the anterior chamber lens implantation. We reviewed the medical records of 15 cases of the former group and 11 cases of the latter one in 1986 through 1988. There was some difference in the postoperative pressure in the two groups, but it was not statistically significant.
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