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라식 수술 후 각막곡률계산법과 각막지형도에 의한 각막곡률의 상관성
구희찬,조소현,김효진,김진형,주천기,Hee-Chan Ku,So-Hyun Cho,B,S,Hyo-Jin Kim,M,S,Jin-Hyung Kim,Choun-Ki Joo,PhD 대한안과학회 2005 대한안과학회지 Vol.46 No.4
Purpose: To evaluate the relation between clinical history method and Orbscan Ⅱ for corneal power measurement after laser in situ keratomileusis (LASIK). Methods: A total of 77 consecutive eyes of 43 patients who were treated with LASIK for myopia were followed up for at least 6 months. Corneal power by clinical history methods (CK) was compared with 3.0 mm zones of simulated keratometry (Sim-K), with 0.5, 1.0, 1.5, 2.0 and 3.0 mm zones of axial power maps (AP) and with 2.0, 3.0, 3.5, 4.0 and 5.0 mm zones of total optical power maps (TOP). Results: Sim-K and all AP-map zones using Orbscan II were significantly higher (P<.001) than the CK value, while all TOP-map zones were significantly lower (P<.001) than the CK value. Among them, 3.0 and 4.0 mm TOP-map zones showed the highest correlation with the corneal power by CK (r2=0.889, P<.001; r2=0.889, P<.001). The correlation was higher with 3.0 mm TOP-map zone (r2=0.800, P<.001) than with 4.0 mm TOP-map zone (r2=0.793, P<.001) in high myopia patients. Conclusions: Although 3.0 and 4.0 mm TOP-map zones of Orbscan II were correlated highly with the CK value, these correlations were relatively low in high myopia patients and 3.0 mm TOP-map zone was better correlated than 4.0 mm TOP-map zone in these patients.
구희찬,박영근,이세엽,이영춘,Hee Chan Ku,Young Gun Park,Se Yup Lee,Young Chun Lee 대한안과학회 2010 대한안과학회지 Vol.51 No.8
Purpose: To experimentally investigate the effect for muscle weakness after superior rectus Z-myotomy and histological changes. Methods: Superior rectus muscle fibers of rabbits (16 rabbits, 32 eyes) were cut transversely with scissors across 75% of the muscle in two different positions on opposite sides. In group 1 (16 eyes), myotomies were performed at 2 and 7 mm from the muscle insertion (5 mm gap) and in group 2, performed at 2 and 5 mm (3 mm gap). The change of mark, eyeball position, and muscle tension after myotomy and 4 weeks postoperatively was evaluated, the location of the mark was examined, and muscle tissue biopsy was performed. Results: After Z-myotomy, the marks of the two groups moved significantly posteriorly from insertion within groups (p<0.05), with no significant differences between groups (p=0.469). Eyeball positions of the two groups moved significantly inferiorly (p<0.05); the amount of position change of group 1 was greater than group 2 (p<0.05). When the globe was pulled in opposite directions for muscle action, the degree of change decreased with significant difference within groups (p<0.05), but there were no significant differences between groups (p=0.32). Conclusions: Z-myotomy of the superior rectus muscle affected the recession of eyeball position and weakened the muscle action. Muscle weakening affected by the different gaps between myotomies did not show consistent results. J Korean Ophthalmol Soc 2010;51(8):1121-1128
구희찬,이세엽,이영춘.Hee-Chan Ku. M.D.. Se-Youp Lee. M.D.. Young-Chun Lee. M.D. 대한안과학회 2005 대한안과학회지 Vol.46 No.7
Purpose: To investigate the clinical features of monocular amblyopia which failed to respond to occlusion therapy. Methods: We retrospectively reviewed the records of 57 children who failed to respond to occlusion therapy. Treatment failure was defined in two ways: visual improvement failure indicating less than two lines of visual acuity improvement, and functional failure indicating a final visual acuity in the amblyopic eye worse than 20/40 after more than 3 months of occlusion therapy. We investigated the clinical features of the patients and also classified and analyzed the factors related to prognosis into fixed factors and adjustable factors according to the adjustability during treatment. Results: The visual acuity of the amblyopic and sound eyes was and average of 0.20±0.12 (0.02~0.5) and 0.80±0.18 (0.5~1.0), respectively. Forty-one patients (71.9%) had strabismus and esotropia was most frequent (65.9%). According to the age distribution, the 5~6-year-old group was most frequent (21 patients, 36.8%). Four adjustable factors, the interval from diagnosis to treatment, good compliance, full term occlusion, and sufficient occlusion, were insufficiently applied to the visual improvement failure group and the functional failure group as 60% and 53.1%, respectively. Conclusions: Clinical features of monocular amblyopia which failed to respond to occlusion therapy were moderate amblyopia with strabismus and relatively younger children. There was room for improvement to additional treatment of 50~60%.
소절개창을 이용한 백내장 수술에서 절개창 길이에 따른 술 후 난시 비교
구희찬,김효진,주천기.Hee-Chan Ku. M.D.. Hyo-Jin Kim. MS.. Choun-Ki Joo. M.D.. Ph.D. 대한안과학회 2005 대한안과학회지 Vol.46 No.3
Purpose: To compare surgically-induced corneal astigmatism after 3.0 mm-sized incision and 3.2~3.4 mm-sized extended incision in cataract surgery. Methods: This study included 205 eyes of 202 patients having phacoemulsification with temporal clear corneal incision. The eyes were classified into 4 groups according to IOL type and incision size: Group A, silicone IOL was inserted using the injector through 3.0 mm sized incision; Group B, silicone IOL was inserted using the injector through 3.2 mm sized incision; Group C, acrylic IOL was inserted using the forceps through 3.4 mm sized incision; and Group D, acrylic IOL was inserted using the injector through 3.2 mm sized incision. The uncorrected visual acuity, autorefractometry, and keratometry were taken preoperatively and at 1 week and 2 months postoperatively. Results: Preoperatively, there was no significant difference between the 4 groups in preoperative astigmatism. On the seven operative day, there was significant difference between the 4 groups with one-way ANOVA test (P=.044), and between A and C, and between A and D with post-hoc tests (P<.05). There was no significant difference between the 4 groups at 2 months postoperatively (P=.945). On the seven operative day, there were significant differences between the 4 groups in surgically-induced corneal astigmatism with one-way ANOVA test (P=.009), and between A and C, and between A and D with post-hoc tests (P<.05). There was no significant difference between the 4 groups at 2 months postoperatively (P=.985). Conclusions: The 3.0 mm-sized clear corneal incision without extension induced early stabilization of surgically-induced corneal astigmatism and rapid visual rehabilitation.