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權達萬 慶北大學校 醫科大學 1970 慶北醫大誌 Vol.11 No.1
A series of experimental studies for diffusion rate, diffusion coefficient, permeation coeffcient and diffusion capacity of the normal and pathological corneas of the rabbits and dogs were performed to investigate the diffusion properties of the cornea to oxygen with the gas diffusion apparatus devised by the auther, and following results were obtained. 1. The diffusion coefficient, permeation coefficient and diffusion capacity of the normal cornea were 1.16×10 exp(-5)㎠/min, 2.71×10 exp(-7)㎠/min/atm, and 4.35×10 exp(-7㎖/min/㎜Hg, respectively in the rabbit and 1.68 ×10 exp(-5)㎠/min, 3.95×10 exp(-7)㎠/min/atm and 4.08×10 exp(-7)㎖/min/㎜Hg respectively in the dog. These values were lower than the values of diffusion coefficient of oxygen to the connective tissues of other animals. It is presumed that these results were caused by histologic peculiarities of the corneal structures. 2. The diffusion capacity of oxygen was decreased while the diffusion and permeation coefficient increased in the edematous cornea produced by injection of alloxan into the anterior chamber of the rabbit, and by the immersion into the normal saline solution in the dog. These findings may be caused by thickenned cornea resulted by edema, which accounted for the lowering of the diffusion and for the increase of the ratio of water content, that enabled more efficient gas diffusion in an unit thickness. 3. The diffusion capacity of oxygen in the neovascularized cornea of the rabbit was markedly lowered than that of the normal and the diffusion and permeation coefficient values were very high. It is specuated that the increase of the diffusion and permeation coefficient were due to the presence of blood in the cornea in which state the gas diffusion become more active than in water. 4. In the dried cornea of the dog, the diffusion capacity was higher and diffusion and permeation coefficient were lower than in the normal; presumably the loss of water in the cornea would be responsible for this results.
權達萬 慶北大學校 醫科大學 1974 慶北醫大誌 Vol.15 No.2
The author experienced a case of pearl cyst of the iris with iridocyclitis. It followed a peneturating corneal injury about one year previously in which a cilia was carried into anterior chamber. The cyst and cilia were removed through a corneal incision in a larger iridectomy satisfactorily. The microscopic findings confirmed the clinical diagnosis of a inplantation pearl cyst. Review of litrature was done.
權達萬 慶北大學校 醫科大學 1974 慶北醫大誌 Vol.15 No.2
The author reported a case of blindness with bilateral altitudinal hemianopsia and bilateral optic nerve atrophy probably induced by administration of oral contraceptive for more than one year, and review of literature was done.