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The Recovery of Optical Quality after Laser Vision Correction
정형기,임태형 대한안과학회 2013 Korean Journal of Ophthalmology Vol.27 No.4
Purpose: To evaluate the optical quality after laser in situ keratomileusis (LASIK) or serial photorefractive keratectomy (PRK) using a double-pass system and to follow the recovery of optical quality after laser vision correction. Methods: This study measured the visual acuity, manifest refraction and optical quality before and one day,one week, one month, and three months after laser vision correction. Optical quality parameters including the modulation transfer function, Strehl ratio and intraocular scattering were evaluated with a double-pass system. Results: This study included 51 eyes that underwent LASIK and 57 that underwent PRK. The optical quality three months post-surgery did not differ significantly between these laser vision correction techniques. Furthermore, the preoperative and postoperative optical quality did not differ significantly in either group. Optical quality recovered within one week after LASIK but took between one and three months to recover after PRK. The optical quality of patients in the PRK group seemed to recover slightly more slowly than their uncorrected distance visual acuity. Conclusions: Optical quality recovers to the preoperative level after laser vision correction, so laser vision correction is efficacious for correcting myopia. The double-pass system is a useful tool for clinical assessment of optical quality.
Structural and Functional Stability of Biomolecules Based on Geumgang Ratio
정형기,이철호 한국전시산업융합연구원 2016 한국과학예술융합학회 Vol.23 No.-
All natures and things of this world make a fixed ratio. Geumgang ratio, the iIndignous formative ratio of Korea is simple, stable, and practical as well as having aesthetic factors of golden ratio, so has been applied to design of building, work of art, and househld item, etc. This study carried out to examine the distinctiveness based on an analysis on various cases of Geumgang ratio and to compare and analyze the link between molecular structure and function through a case study on Geumgang ratio discovered in biomolecular structure such as nucleic acid, protein, and ribonucleoprotein forming biosystem. Geumgang ratio was found in ancient remains, traditional buildings, traditional furnitures and household Items in this country and in nature such as pruning of syconus and petal number of plants getting out of Fibonacci number. The ratio could be found in the biomolecular structure such as nucleic acid, zymoprotein and ribonucleoprotein. Based on the results obtained in this study, it has been considered Geumgang ratio could be served for not only industrial design of commercial item but also the molecular design of new drug such as anticancer and biologically active agents. In Advance, the more detailed researches on having visual data on the level of nanoscale using electron microscope(EM) or scanning tunneling microscope(STM) would be needed for the practical application to biomedical field.